You know Warren could be a possibility. DH has jokingly nick named the baby Warren from time to time as he will be born in the year of the rabbit & around Easter time. But he has said he was never serious about the name. But its kinda grown on me a little bit. So I think it might be worth putting on the list.

DH's list has been
Ronan (although it was my suggestion over Rowan)
Rowan
Brian
Dylan

Thats it I think.