Mikio \m(i)-kio\ as a boy's name is a variant of Miki (Japanese), and the meaning of Mikio is "tree".

The baby name Mikio sounds like Miko, Mikey, Mike, Miky and Michio. Other similar baby names are Mario, Mikal, Mikol, Mikel, Milo, Mirko, Morio, Niki, Niko, Nikko and Riki.