After thinking for a long time, I realised I'm not gonna change Sai's name. She's not just a character, I'm emotionally connected to her. I love her, and changing her name changes her image in my head as well.
I was thinking of changing it because I thought her name's pronunciation would sound weird and people would pronounce it wrong. But never mind. Sai remains Sai.
She's pronounced as "सई".