Anamta is a word in the last verse of Surat al-Fatiha (Quran 1:7): "the path of those You have blessed; not of those who have incurred Your wrath, nor of those who have gone astray." Anamta means "You have blessed". The meaning is good therefore inshAllah feel free to use it.
Anamta is pronounced [(U)p] + [(NUM)ber] + [(TU)mmy], though you are free to pronounce it differently.
However, note that this is a peculiar name since it is not a word, it is a phrase ("you have blessed"), though we don't see a reason why this should be a problem.