Hi there.
I think that [name_m]Rafferty[/name_m] is really cool, & I especially love it for the sleek, sporty, dashing nn of [name_u]Rafe[/name_u]. It’s unique w/out being weird, which is always a good place to be. [name_u]Umber[/name_u] is not my cup of tea, but I guess that [name_m]Rafferty[/name_m] Umbert sounds okay.
As a brother to [name_m]Rafferty[/name_m], what about…
Alistair/Ace
Bastian/Bash
Conall
Cillian
Casey
Caspian/Cas
Desmond/Dex
Declan/Dex
Eamon
Finnian/Finn
Finnegan/Finn
Harrison/Hank
Jameson/Jem
Laurence/Lad
Malachy/Mac
Mackenzie/Mack
Niall
Sebastian/Satch/Seb/Bash
Sullivan/Sully
Thatcher/Thatch/Thax
Tristan
Whitman/Whit
Wilder/Wiley
Hope this helps. 