Practical aspects of changing your name in a common law jurisdiction Common law jurisdictions, in stark contrast to civil law jurisdictions, are considerably liberal in their procedures for allowing a name change. In some cases, for example in Ireland: no formality set out in law in Ireland for the change of a person’s name or the assumption of another name. You may change the name you commonly use by simply adopting a new name (source) although deed poll exist. US states vary, but in some assuming a new name openly could suffice. Assuming that no intention to deceive is at play, how would a person who changed his name from, say, John Suzie McMillan Manson, to John McMillan, would prove that he's the owner of his car, house, company bank account, and so on? How could government agencies and institutions connect that new name to his past name?
I am a notary public in Vermont and have had to deal with people who had name variations. Readers of Law StackExchange like to citations to reliable sources; I'm not going to do that, just describe my experience. Many states do indeed allow a person to adopt a new name through usage. Government agencies and large commercial agencies don't like that, and they can and do thwart the law by imposing their own administrative procedures. If you don't like their procedures, fine, give a lawyer a $20,000 retainer, have the lawyer sue, and wait three years. And after spending all that money, the court might find that although it isn't a crime for a person to change their name by usage, there is no law requiring the administrative agency to accept it. If you don't have tens of thousands of dollars to waste or years to wait, you have two choices. Get married, and use the marriage license as evidence of your name change. The format of marriage licenses is different in every state, so how well this works depends on the state. The other option is to get a court-ordered name change.
You sue the legal person One of the things that distinguishes legal personhood from other structures is the ability to sue and be sued. You can't sue a business name or a trust for example but you can sue a company. I have in fact been required to make adjudication decisions that I know will be unenforceable in court because the applicant named a trust rather than the trustee.
It is a false statement to claim to live in one county when you actually live in a different one. It becomes perjury (a crime) when you falsely swear to that statement on your status report, and you are required to report changes in &quot;household situation&quot; within 10 days. There isn't an exception allowing you to give a false address &quot;in case it costs more to report truthfully&quot;. The only legal solutions are to report truthfully and pay more, or move again, report truthfully, and not pay more.
In general, providing a false name or birthdate (DoB) is only actionable when there is a legal duty to provide the correct information, or when a provision of a contract to which the person agreed requires it. If the falsity is part of a common-law fraud, then it would be unlawful, and possibly criminal. In the cases listed in the question: Sign up for an online service with a false identity although the ToS requires an accurate identity: This would be a breech of contract. Whether there could be a successful suit for such a breech would depend on why the contract demanded an accurate ID, and what harm the lie did or might do. Use a false name at a restaurant or hotel, but with no intent to defraud or avoid payment. I don't think there is any duty to give an accurate name on a restaurant reservation. In some jurisdictions the law requires an accurate name be used on a hotel register, and valid ID presented. But such violations are rarely pursued, unless they are part of a fraud or some other criminal activity (theft, prostitution, or drug dealing, say). Giving a false name when opening a bank account or other financial account. In the US, and I think many other jurisdictions, the law requires accurate identification of all bank account holders, including a SSN, EIN, or TIN. It also requires a bank to make efforts to verify such IDs, and violation are prosecuted. There are legal ways to get an account under an alternate name such as a penname or DBA, but this must be disclosed to the bank and to the IRS. Other cases that occur to me: Giving a false name at a shop when not obtaining credit or avoiding payment: generally legal. Obtaining a credit card under a false name: Can be done legally if disclosed to the issuer. Giving a false name or DoB to a pharmacy for a prescription: unlawful if attempting to access the medical info of another, or rely on another person's history to get a prescription, but may be lawful if this is just an alias, such as a celebrity might use to avoid publicity. Unlawful if done to obtain a controlled substance, or if insurance fraud is involved. Putting a false name on a job resume: lawful, but if hired an I-9 form will require a valid name and SSN or TIN. Employers usually may not require that a DoB be provided. Giving false info as part of any credit application: usually considered fraud, even if there is no intent to avoid payment, as it can deceive the creditor as to the amount of risk involved; specifically criminal in some states. Giving a false name on a date: perfectly lawful, but may cause a problem if a long term relationship develops. Some states require a valid name on a marriage license.
If you say something twice, eventually they’ll be in conflict Law codes are vast. They deal with many things and sometimes, as here, they deal with the same thing twice. If they duplicated themselves, rather than cross-referencing, every time the law was changed, every single instance would have to be tracked down and changed. Admittedly, that is not as big a problem with digital codes (but still not infallible and definitely time-consuming) but when these would have to be found by hand, it was damn near impossible. Written this way, change it once and it’s changed everywhere. My first boss taught me that. The fired was engineering rather than law but the principle is the same.
There is no requirement to name the parties to a contract I just bought a cup of coffee. I did not give my name to the other party to that contract and while I know the name of the shop, I do not actually know the legal entity I contracted with. Nevertheless, we have a binding contract and, for example, if that coffee gave me food poisoning, I would have legal recourse under that contract. Similarly, there is no difficulty signing a contract under a pseudonym - it still creates a legally binding relationship. The practical difficulties While there is no legal problem, there is an evidentiary one - if someone enters a contract and later disclaims doing so, how do you prove that they did? Or vice-versa, if someone alleges that it was you that entered the contract, how do you prove that you didn’t. What you need is some way of definitively but anonymously tying the person to the contract. I can think of lots - a fingerprint, DNA, public key cryptography, a trusted third-party intermediary to name just a few. This is essentially a technical problem rather than a legal one.
I will not speak to your specific situation. I am unfamiliar with the jurisdiction and real estate contracts are one of the most highly regulated contracts so local statutes may override common law. In general, the terms of a contract are what the parties agree; the written document is not the contract - it is evidence of the contract. In a case where the parties agree that the written version is wrong then the written version is wrong. Where the parties disagree that the written version is wrong (or agree that it is wrong but disagree as to how) then each will need to provide evidence to support their position. A signed written contract that supports one parties position is extremely strong evidence! The other party would need to provide some overwhelming evidence to trump this. The general position that the courts take is that the written contract accurately documents the agreement unless someone can prove that it doesn't.
Ohwilleke's answer (i.e. 'there isn't a simple answer') covers the general principles clearly. But for your specific situation (England and Wales, appeal to the High Court Chancery Division or Court of Appeal), the answer is "Do nothing irrevocable if possible; if necessary, apply for interim directions to the Court". The Chancery Masters are used to this sort of application, and though somebody will presumably be diappointed by the decision, the trustees have no liability.