Using same name as other family members

[YourNewspaperIsShit]

It's a solid 'normal' name, for example Cameron (it's not Cameron, actually it's even more common than that) and was DGF's name.

Auntie (his DD) used it as middle name for her DS.
DSis used it as middle name for her Ds1.
DSis2 has said she will use it as a middle name for DS1 but isn't actively trying.

I want to use it for a girl, but is all that usage too far? (It is a unisex name that's not what bothers me).

[babyblabber]

Not at all. If you like it and it has meaning to you then it's perfect!

[Niks2026]

I think it would actually be nice as everyone seems to have used the name in one way or another. Kind of a tradition and an honour to the dgf