Solly is an extraordinary Jewish name. I must say I laughed. If you've no problem with that then Solly would be a lovely name and easy for him to learn.Well, ya gotta be mighty and wise when your faced with a challenge, so I would choose Solomon and call him Solly for short! All my kitties usually end up being called "Baby" because I always hold them a lot and call them "My Baby", so they usually have two names, they don't seem to mind!