For Sphinx,
this site gives some popular names for Sphynx cats. I vote for:
Hasina– Means lover.
Kamilah– is an Egyptian for perfect.
Magna– is a unisex cat name meaning large.
Either of these work for me, since Sphynx is not only perfect but also large and I’m sure a very cuddly lover.
For Trixie’s Mom I’d say Showcase Spectacle based off her creator’s
tweets. If that’s too unwieldy then I also vote for Dandy Lion.
Fluttershy’s mom gets a “Posey” vote from me. It was Fluttershy’s prototype name so it has some depth to it.