title: Telegram API how to get a user First Name and Last name by telegram username
body: <p>I need to get information about a user from @username. I'm not using telegram bot. I have a list of usernames, and I need to get information about users(First name and Last name). </p>
  
  <p>How can I implement this in java? Is it possible? Maybe some website can give information about user from username?</p>