I like
Mikaela and
Makena. I can also get behind
Makenna.
I'm not a fan of how
Mack looks written down so I dislike Mackenna and MacKenna as well as
Mackenzie and MacKenzie. I'm fine with McKenzie.
I like how you could use
Mika as a nickname for
Mikaela.
Michaela,
Makayla,
Mikayla all don't look appealing to me.