"Blend of Makayla and Lynn"
The name Makailyn is commonly a female name from the "American" origin.
Makailyn is a modern American formation that first appears in US birth records in 1998. Its form joins the Makayla element, an American spelling of Michaela, to the -lyn ending that appears in many American girls' names created in the late twentieth century. The spelling itself has no earlier history in any language tradition.
The pronunciation of Makailyn is muh-KAY-lin.