Isobal is not as common as Isabella, and I'd say both are really declining in popularity - 5 years ago in kindies we were seeing 3 or 4 in a group, but right now there's hardly any (in that time I've also moved from Vic to Qld) which is what makes me think it's much more common among kids already at school.
Go for it, it is such a lovely name.
I don't know any...so far DS hasn't been to kindy/school with any Isobels and neither has DD. It is actually one of our favourite names for our bub too - I know it is high up the popularity scale, but TBH how 'common' a name is has never bothered me - if I like it, I like it and I don't really care how popular it is.
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