This is actually cute, I could see it making a comeback.I prefer it as a nickname for Ronan or Ronald. For a girl it is a cute nickname for Ronja, Ronia or Veronica.I also kind of like it on its own because the Hebrew name Roni means "joy, song" (pronounced like Ronnie) and I think it's really friendly and cute.
― Anonymous User 5/15/2021
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I think Ronnie is such a playful, mischievous name - but, simultaneously, one that is able to grow and mature with the bearer. I find it handsome on men, and while I have yet to meet a female Ronnie, I would be very interested to do so (traditionally "masculine" nicknames on girls fascinate me; I myself go by Frankie).