Kienen \ki(e)-nen\ as a boy's name is a variant of Keenan (Irish, Gaelic), and the meaning of Kienen is "ancient".

The baby name Kienen sounds like Kienan and Keenen. Other similar baby names are Kieren, Kieran, Kannen, Keene, Keen, Keegen, Keenon, Kenan, Kenn, Kinney, Keven, Kierren, Kieron, Kiernan and Tienan.