What I say: "Hekapoo" (the name of a character from Star Vs. the Forces of Evil).
What my phone hears: "Heckapoo," "pecapoo," "Hackaboo," "Packaboo," or "Hecka poop," depending on its mood.
UTF-8 rocks, saying that as a coder. You can’t tell the difference when it’s English, pretty minimal overhead in the related European languages, and able to handle all the languages. Main drawback is if you’re dealing mostly in the asian languages, it’ll be a bit larger in file/data size than UTF-16.