Unique, Unusual & Celebrity baby names list made by Romy Marylou Amber Joosten

Kaiya reached a peak of Number 652 in 2002. This spelling performs worse than its sisters Kaia and Kaya, and it likely creates more pronunciation confusion.

Like Cassidy, Kassidy peaked near the turn of the millennium and has lost ground in recent years.

Kaylynn follows a current trend in naming: add a -lynn or -lin suffix to a simple, single-syllable moniker. Alternate spellings include Kailyn, Cailin, and Kaylen. This variation has one too many Ys, and one too many Ns.

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. Kylian is another spelling that's gaining traction, thanks to French soccer star Kylian Mbappé. Possible downsides: an unsavory first syllable and a connection to the trendy brew.

Chosen for their first son by musical couple Gwen Stefani and Gavin Rossdale, this Jamaican place and elegant British surname also boasts the more regal yet user-friendly short form, King.