Learning Names

After 4 weeks of classes, I feel like I can finally start learning students names. I'm getting into the groove of teaching, getting the feel for the different grades and schools, getting to know the students, and the students are starting to get to know me as well. Learning names, though, isn't that easy for a few reasons:
1) Most students look very similar with their dark hair and uniforms.
2) I have over 500 students.
3) Pronunciation of their names is a challenge.

Some names are easy to pronounce: Ana, Carlos, Frank, Maria, Roberto.
Some names are pronounced the same as in English, but spelled phonetically in Spanish:
Anlly = Annie
Greeys = Grace
Yuri = Judy
Deysi = Daisy
Dayan = Diane
Geny = Jenny
Some names are spelled the same as in English, but pronounced the Spanish way:
Jaime = Hymie
Heidy = Aidy
Janis = Hanees
Jonathan = Honataan
David = Dabeed
And still other names can be spelled the English or Spanish way, and it is up to me to guess if it is pronounced the English or Spanish way:
Yaquelin and Jacquelin (Y/J)
Wilmer and Vilma (W/V)
Ervin and Urbin (V/B)
The final thing that makes learning names challenging is that I have many students with the same name. I'm amazed at the variety of names, but I still have:
5 students named Vilma
6 students named Ana
11 students named Carlos

And by the way, I see each student once a week. I can't really play name games in class, because that isn't teaching English, and they already know all the names of their classmates. So if you have any tips on learning and remembering names they would be greatly appreciated. I'm working at it, and this week I have felt a sense of accomplishment in being able to recognize students and give them the correct name tag without asking their name. Some I can even call by name at recess or after school. It's a good thing I have 10 months to learn their names : )

Heidy and Johana, grade 6 students at Mocohan.