system
Given the following post, respond as if you're commenting on Reddit:
human
[Stargate] Why does everyone speak English?  Why does Jonas Quinn have an Irish name?

This has really been bugging me lately.  When they first visit Chulak, most people they meet do not speak English; Daniel has to translate.

Teal'c, however, speaks perfect modern English, as does every human and Jaffa they meet from then on.

How is it possible that everyone in the galaxy speaks English?  And even in the Pegasus Galaxy?  How come the Goa'uld and the Wraith speak English, but the Unas do not?

And *even if* I accept that all these people do speak English, how come Jonas Quinn, an alien, is named "Jonas Quinn", both names with clear Earth-based etymology?  Other people from his planet have names like "Noor", "Tomis", "Sevarin", and "Dreylock".
gpt
i see you've mistaken the historical re-enactments for the actual events.  In reality the "SG-1 missions" (really a compilation of several teams events dramatized and with certain incriminating or embarrassing incidents glossed over) involved extensive work by translators, often sending at least two or different ones would accompany different teams depending on need.  Most conversations seen on the show were in fact (statistically) originally spoken in gou'uld, which all personnel were trained in due to its extensive use through out this galaxy.