If Scottish, which Clan?

In doing some genealogy I've found my great-grandfather on my grandfather's mother's side is a McMichael, born in Thornliebank, Renfrew, Scotland. His father was born in Tamlaght Finlagan, Londonderry, Ireland and his father was born in Thornliebank.

Is McMichael a Irish or Scottish surname and if Scottish what clan would they most likely belong to?

This may start my quest for my next tartan....


NOTE TO MODS: If there is a more appropriate forum please move it.

Kent