Quick answer
McKenna is a girl name.
Meaning and history
From an Irish and Scottish surname, an Anglicized form of Mac Cionaodha, itself derived from the given name Cionaodh. As a given name, it was very rare before 1980. It rapidly increased in popularity during the 1990s, likely because it was viewed as an even more feminine alternative to Mackenzie.
Notes and context
Usage: english