I've never heard
Gillian pronounced with a hard G. I've also never heard it on a guy. But with a hard G, it's not too far from the sounds of Gilligan and
Gilead, so in that way it's not so far-fetched.
Three boys nappin', one mama namenerdin'
To peruse my top 100ish names:
http://www.behindthename.com/pnl/82589To peruse my non-name musings:
http://jodifriesen.blogspot.ca/