Killian – aka Cillian – is a spirited yet resonant Gaelic name that was borne by several Irish saints and could make a distinctive replacement for the dated Kelly. Possible downsides: an unsavory first syllable and a connection to the trendy brew.

Yes, another surname, turned boys' name, turned unisex name. But we think this one has a bit more going for it than Logan or Mason, given its similarity in sound to very traditional feminine names Gillian and Lillian.