No, I've never seen
Gillian as a man's first name. I haven't heard it pronounced with a hard G either.
However, my own name book also lists Gillean (hard G) as a masculine Gaelic name meaning "servant of St
John" and lists
Gillian (masculine, hard G) as a variant of it. It says Gillean is rare and almost exclusive to Scotland.
So either it's the same book, or the same original source?
Anyway, where I live it is certainly not a unisex name.
Gillian is
Jillian and feminine, and using a hard G is a naive error. The hard G isn't wrong - the word gill has one, after all. But that's not the convention I know for
Gillian.
I think a man named
Gillian prn. Ghillian would not be like a boy named
Sue. He'd be like a boy named
Meredith prn meREDith.
- mirfak