Pronunciation

[WorstWorkshop]

I'm making a YouTube video about the separator, and in my research, I've found very little connection between the work and the designer. I'd like to talk a little about the separator's development, as presented here, but I have a problem. I don't know how to pronounce Thien, and there's disagreement among YouTubers.

Is it pronounced like THEEN or like THINE??

Thanks in advance!