I’ll tell you what’s not mine: fav.
Let me explain why.
Almost any time I read it, I read it as though it rhymes with have. I know of course it’s supposed to rhyme with gave, to replicate the sound of that first syllable of favourite, but I can’t help it. There are no words in English which feature av without a vowel after them which rhyme with gave. Therefore, I can’t help reading it to sound like have.
There’s obviously a logic behind using fave instead, in that in more clearly looks like it should rhyme with gave (though there are words with similar spellings but different pronunciations, like have). I suppose people don’t like it though, as there’s no E after the V in favourite. Personally, I think including the E in fave is a perfectly reasonable compromise: it’s only an abbreviation, after all.
But I get why people don’t like including it and go with fav instead. It’ll never be my fav though.
English-Language Thoughts 
There’s also the spelling ‘fave’, which has the advantage of sounding like it looks, but the disadvantage of being less obviously derived from ‘favo(u)rite’. When searching for information about this choice, I found, eg https://www.fastcompany.com/3034831/fave-vs-fav-a-linguistic-explanation.
LikeLiked by 1 person
I always wonder why ‘fridge’ is short for ‘refrigerator’–where did the d come from?! Have you done that one before?
LikeLiked by 1 person
No, but I think it’s because that’s the only way to keep the soft g sound. “Ige” can make that sound if there’s another syllable after it. But if there’s no syllable following “ige,” it has the sound of the second syllable of “oblige.” So in order to keep the same sound as “refrigerator,” we have to add the “D.”
LikeLiked by 1 person
Makes sense!
LikeLiked by 1 person