Go on, speak it out aloud. Su-na-ya-na.
It's pronounced Soo-NA-e-na, focus on the second syllable and none on the third. I only spell it the way I do because my Bengali grandfather spelled it that way and a Bengali would pronounce my name Shoo-nau-yo-naa where the 'ya' is drawn out the wee-est bit.
A lot of non-Indians have this problem with pronouncing Sunayana, they simply don't know what to do with the 'ya'. I was reminded of it when I watched the Persian version of the BBC Blogworld Superpower show where they used clips from my video.
Now you know why Afee called me Sue all those years ago!