I generally pronounce it with a long I, because that's how most people say it due to hearing the old song about my darling Clementine who managed to drown even with her ruby lips above the water blowing bubbles. (I don't think the girl in the song was terribly bright.)
But I do have a friend whose grandmother, in her nineties, is named Clementine, pronounced with a long e sound like the fruit.
Regardless, I don't like it, it sounds cartoonish and like a stuffed animal.
And Clementina just sounds like a fruit-flavored drink, like Orangina.
Before you criticize a man, walk a mile in his shoes. That way, when you criticize him, you're a mile away and you have his shoes!
Steve Martin
This message was edited 11/27/2020, 6:05 AM