Sriracha is the generic name for a Southeast Asian hot sauce from Thailand.It is named after the seaside town Si Racha, where it was first produced as a local product.
Kinda hard to do a copyright on a name like that but you try and put Tabasco on your bottle of sauce and you will have lawyers on you 5 mins later.
One of Edmund McIlhenny's sons, John, fought with the Rough Riders, and became friends with Theodore Roosevelt.
When T.R. became president, John asked him to pull some strings with patents and copyrights, and that's why the name 'Tabasco' is untouchable.