s it okay to make up your own surnames?

Yes it's perfectly fine cuz my friend did it 2 :) good luck

Sure, it's your story and your imagination. If it makes sense with the character and blends in with the story, o just..something inside tu tells tu to use it, then go right on ahead :)


There's a saying I always have when it comes to writing;
"Trust the gut"
If there's any idea that suddenly strikes tu and tu from within that it's a good one, trust yourself. And go for it :)
Think about it if tu wish to, but I'd suggest that tu listen to yourself when tu have some type if intuition like this. ^^