could I get away with calling my child Hermoine?

[trampsypantsy]

Or would she be ridiculed?

Hermione is lovely. Ava is also lovely but so incredibly common.

I much prefer Hermione to Ava.

Definite use the proper spelling.

I have known the name pronounced Her-my-on-ee and Mer-my-nee. Think that is often just down to accent though.