[Fainnamoony]

Being Thai is as far as I know mainly a question of where you live and who your parents are. If you have a Thai mother or father you get automatically a Thai nationality. Though I am not sure if the same rule applies when living not in Thailand.

It is nearly impossible for foreigners i.e. Faragns to get a Thai passport at least there are no cases known to me.
If your name is Tiger Woods (half Thai) Thailand will ask you if you want to have a Thai passport after becoming famous.

greetings