One of my dogs is named Merlin too. ;)
Since you're getting used to Jerred, maybe you should choose a name that sounds a little similar.
Fred (just kidding!)
If you're into fantasy (as Merlin implies) how about a character from a favorite series or movie? Perhaps another wizard, to go along with Merlin?
The other thing you can do, which I do whenever I'm adopting a new dog, is browse through the baby name sites on the web. Sometimes a name will jump out at me. You can search on a country/culture, or on boys/girls, or sometimes on other things to narrow the field.