Killian--aka Cillian--is a spirited yet resonant Gaelic surname that was borne by several Irish saints and could make a distinctive replacement for the feminized Kelly. Possible downsides: an unsavory first syllable, and a connection to the trendy brew.
Killian Brennan, Irish footballer
Killian Overmeire, Belgian footballer
Killian Miller, former U.S. Congressman from NewYork
Killian Gastineau, son of NFL football player Mark Gastineau and actress BrigetteNielsen