tartaneskimowifey's list "Longer names" of 3 great name ideas: Rafferty - Macgregor!

Longer names

A list of longer names that I think would work really well with a one syllable surname.

Jaunty and dapper, Rafferty is one of the most engaging of the Irish surnames, used by Jude Law and Sadie Frost for their son in 1996. Derived from the Irish, O'Raighbheartaigh, it means "(spring) flood tide", though some sources relate it to the Old Irish rath meaning "abundance" and "prosperity."
 Preppy and energetic but earthy too, it also comes with cool nicknames Raffy, Rafe, and Raffa. A rare choice in the US, it has been appearing in the England and Wales Top 1000 since 2003 and has more recently appeared in the Top 250.

Rafferty

Willoughby is an energetic last-name-first route to the popular short form Will, livelier than any of the two-syllable options. It could be picked up by parents attracted to the Willow sound for girls.
 Willoughby Patterne is the protagonist of the George Meredith novel, The Egotist. Willoughby Sharp was a contemporary artist, curator, critic and founder of the seminal art magazine, Avalanche. There is a classic 1962 British children's novel titled The Wolves of Willoughby Chase by Joan Aiken that was made into a film in 1989.

Willoughby

Interesting possibility for the son or grandson of a Gregory. 

Longer names

The names

Rafferty

Willoughby

Macgregor