I wish I knew op! It's so ridiculous, but when I hear a name a lot, it automatically puts me off ever using it myself
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I think, for me, it's a bit like if you repeat a word to yourself over and over again and it suddenly loses all meaning. That said, I only feel that way about the really popular names and it isn't like it would put me off the person, so meh.
The other argument is that because names primarily exist (imo) as a way of identifying someone, then it's not great if you shout "Isabelle" across a playground and six little girls turn around.