The pearl tea name came later, due to the vulgarness of it's predecessor I guess.
Now, you can enjoy more next time you suck on those sweet bouncy topioca.
It was said that one bubble tea maker in Taiwan made large tapioca bubbles to put in milk tea, when tiny bubbles were used in milk tea at the time, and he named it "Boba tea", associating the relatively huge size of his bubbles with the actress well-known body feature.
Granted, I now know this is wrong, since it's apparently a straight-up mashing together of the words for "big" and "bubble". So, funny how languages work.
As opposed to 'Thai tea', which is a milk tea too, just the flavor and color are kinda specific. Besides, Thai tea in most places is really a 'Thai iced tea', I gave up on asking if it could be served hot (which it could, and tastes good too).
Meanwhile, the milk tea in most shops I've been can be served hot or iced on demand. Moreover, the kind of tea used can also be selected.