Keelan

They'll always be your little one in your eyes, so this name, meaning "small; slim" will be the perfect fit. Keelan has Irish origins and is the anglicized form of Caelan and Caolan. The name comes from the Irish word caol, meaning "slender." Although it's most often used as a name for boys, Keelan is versatile enough to work as both a masculine and a feminine name.