If subpoenaed for a federal Jan 6 trial in Wash DC, am I entitled to expenses?

[Effete Snob]

12. Ummmm

“ He has a very common name so I couldn't find anything on social media or a Google search that might give me a clue. ”

Presumably you have the docket number of the proceeding, and regardless of how common his name is, you can probably get the complaint from the RECAP archive:

https://www.courtlistener.com/recap/

Criminal prosecutions are public proceedings, even if they aren’t done on social media.

https://apnews.com/article/nm-state-wire-government-and-politics-journalism-riots-70192823f35380b860b6f2708904bc5c