Keillan \ke(il)-lan\ as a boy's name is a variant of Keelan (Irish, Gaelic) and Kellen (Gaelic), and the meaning of Keillan is "small, slim; slender".

The baby name Keillan sounds like Keilan, Keallan and Kellan. Other similar baby names are Dillan, Gillan, Kelan, Keallin, Kealan, Kellin, Kelvan, Keiran, Killian, Killean, Kilian, Kilean, Mellan, Neilan and Quillan.