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It's in keeping with their "Tick-Tock" naming since Snow Leopard:

Leopard (Tick) -> SnowLeopard (Tock)

Lion -> Mountain Lion

Mavericks -> ...(uuhhh...whoops?)

Yosemite -> El Capitan

Sierra -> High Sierra

Mavericks was a work-in-progress shitshow of a release, that's probably why it never got a "tock". Apple was keen to let people forget.

I think they missed a trick by not naming Mavericks as Los Gatos, which is a suburb quite close to Cupertino and has some connections to Apple.

Los Gatos translates as "The Cats" so it seems like it would have been a nice way to end the big cat naming scheme.

And put a suburb photo on a wallpaper?

Mavericks was when OS X/macOS became free (as in no $$ to update to.)