A variant of McKenna, from a Gaelic surname meaning "child of Cionaodh," often interpreted as "born of fire."
Mckennah is a feminized, elaborated variant of McKenna, itself a transferred surname from the Irish Gaelic Mac Cionaodha — "son of Cionaodh," where Cionaodh breaks into "cion" (affection, respect) and "Aodh," the ancient Celtic fire deity. Aodh was one of the most important divine figures in the pre-Christian Irish pantheon, cognate with the Welsh Aedd and connected to the broader Indo-European root for sacred fire.
To carry a name meaning "descendant of fire's devotee" is to carry a small ember of that mythology. As a surname turned given name, McKenna followed the Anglophone trend — especially pronounced in the American South and Midwest from the 1990s onward — of repurposing Irish and Scottish clan names for daughters. The added "h" in Mckennah is a softening flourish, a visual cue that the name belongs not to any particular family tree but to the child who wears it. It joins a constellation of similarly constructed names — Makenna, Mckenna, Makennah — each a slight variation on the same Celtic fire, each staking out a small patch of individuality within the broader trend of surname-as-first-name naming.