Amya - Amaya is one of my favourite names. I wouldn't have thought to pronounce this spelling that way (I'd have guessed Am-ya like An-ya) but I'd learn as would anyone else confused so it that's how you want to spell it, I'd go for it. I've seen Amaya, Amaiya, Amaia and Amaiyah so Amya is just another variant, I'm sure!
Deena - not keen but that's possibly because I've only ever known one and I didn't like her do it's coloured the name for me.
Liyana - fine. In the UK it's quite 80s/90s but that doesn't follow that it is for you. I wouldn't have any problems with that spelling in pronouncing it Lee-arn-a, that seems natural to me.