I love the name and would be thrilled to meet a baby
Abraham! It certainly isn't common here in Australia, so that's a bonus.
Abe and Abie are great nn's. I think it fits in well with the other names you like, though I wouldn't pair
Abraham and
Ambrose together in a sib set, as they are a little too similar imo. As for combos I like:
Abraham Rufus ArnoldAbraham Tobias ArnoldAbraham Ezra ArnoldAbraham Rex ArnoldAbraham Chester ArnoldAbraham Dexter ArnoldAbraham Jethro ArnoldAbraham Rupert ArnoldAbraham Silas ArnoldAbraham Leo ArnoldAbraham Gene ArnoldAbraham Wesley ArnoldAbraham Louis ArnoldAbraham Elliott ArnoldAbraham Felix ArnoldAbraham Asher Arnold - Had to make one combo of all A's!!