Cat With No Name

We have a cat that looks very similar, and her name is Nina. Maybe Pinta or Santa Maria?

Molly says: Hmm, Mina crossed our minds, so maybe it's a thing. Thanks, Jeff.

She looks very serious: perhaps Minerva?

I'm gonna say "Minnow" or "Minimoog." The latter would be a good nickname regardless of the cat's actual name.

Could go with a Greek nymph instead - Harmonia, Clytie, Echo, Daphne, Aegina...

Calypso might be appropriate, since she'll probably prevent you from leaving the house as much.

Hecate, HEKATE (or Hecate) was the goddess of magic, witchcraft, the night, moon, ghosts and necromancy. She was the only child of the Titanes Perses and Asteria from whom she received her power over heaven, earth, and sea.
Hekate assisted Demeter in her search for Persephone, guiding her through the night with flaming torches. After the mother-daughter reunion became she Persephone's minister and companion in Haides.
http://www.theoi.com/Khthonios/Hekate.html

How about Isis?

I have a Russian Blue who came in to my life 14 years ago as a stray cat and ended up being called (by default) Murphy Gray... it wasn't until a few years later I realized the perfect name for her would've been the Russian word "Kukla" (or Kookla) which means "doll or puppet" (if anyone remembers the old children's show, "Kukla, Fran and Ollie")...