If you like Milo but can't use due to the cat, what about Jago (Cornish for James) or Ivo? Jago could be Jay for short.
Edmund/Edwin/Edgar (Ed, Eddie, Ted, Teddy, Ned, Neddy)
Nathan (Ned, Nath or Nate)
Asa
Patrick (Pat, Paddy)
Alistair (Al, Ali)
Alexander (Alex, Xander, Al, Alec, Sandy)
Barnaby (Barney)
Jonathan (Jon, Jonny, Jonty)
Richard (Rich, Rick, Ricky)
Nicholas (Nick, Nico)
Christopher (Chris, Kit)
Ernest (Ernie)
Louisa (Lou)
Rachel (Rach, Rae)
Sarah (Sally or Sadie)
Susanna (Susie or Suki)
Lydia (Lyds)
Cassia (Cassie)
Cassandra (Cass, Cassia or Cassie)
Morwenna (Wenna)
Marisa (Risa)
Marissa (Mari or Rissa)
Larissa (Rissa)
Laurel (Loz)
Juliet (Jet or Jules)
Juliette (Jet, Jules, Ettie or Etta)
Henrietta (Etta)
Isadora (Issy or Dora)