bp27: My cousin was named after my grandfather’s stepmother whose name was Tehilla. She lived most of her life in pre-Holocaust Poland. You’d be surprised at how many people had non-Yiddish names.
If now people were starting to commonly name their kids names out of the gemara or something, like Nehorai or Huna, then okay, maybe I could see your argument. At least when we use Yiddish names, we’re usually naming after people. But Hebrew names (at least from lashon Hakodesh) shouldn’t go out of style or be a fad. They’re eternal. In the end, yes, maybe Yiddish names will die down. DO people still call their sons Adda and Ravina? It was perfectly common in Bavel. DO people still, as a matter of course, call their kids Astera and Regina, which are perfectly accepted names in Ladino, a language used by thousands upon thousands for hundreds of years? What is the essential difference between these and Yiddish?
By me, though, and by most people I know, it’s a taste issue. You can ask why I don’t like Yiddish names, and I’ll tell you I like some, but I like the sound of other names better. It just happens to be.