This is my name, yet it also the name of my cousin and deceased grandmother so it's not very original in my family. I am Ukrainian and it is pronounced an-ya, yet spelled this way and pronounced the English way in obviously English. I do believe there is another root, Ana in Spanish?
In Poland we pronounce it an-na (not like in English 'ana'). This is also my name :) But this form is used only in official situations. My friends and family use pet forms like Ania or Anka.