It's certainly better than McKenna, but not a lot. They're too similar, and a lot of ignorant parents will probably be thinking they just named their daughter a "unique" version of McKenna, when they just saddled her with an entirely different name all together.
No, this name is for both genders. It is traditionally unisex; the Kikuyu do not interpret 'masculine' and 'feminine' names the way we do. As for famous bearers, actress Helen Hunt has a daughter named Makena, born 2004.
-- Anonymous User 4/7/2013
Actor Taylor Lautner has a younger sister named Makena.