Kellen \k(el)-len\ as a boy's name (also used as girl's name Kellen), is pronounced KEL-en. It is of Gaelic origin, and the meaning of Kellen is "slender". An ancient given name. May be related to Kell, or possibly (Old German) "swamp".

Kellen has 9 variant forms: Kaelan, Keelan, Keilan, Keillan, Kelan, Kelden, Kellan, Kelle and Kellin.

Baby names that sound like Kellen are Collen, Cullen, Gillen, Kalen, Keallin, Keallan, Kealan, Kelwyn, Kelwin, Killean and Kylen.