"Anzila" is mispronunciation of Anzala ("Allah sent down") or Onzila ("it was sent down").
If you like "Anzila" you can use it. Please see this answer for more information on it: I have kept my baby girl name as Anzila Rehma since last 2 years
As for Affrah, it might refer to any of these names: Afarah, Afar, Ufairah, Afari and Afraa, which are all girl names meaning "pure in whiteness". Affra also means the 13th night of the lunar month, because the moon is white and almost full in the sky on this night. You can use these as names since their meaning is acceptable, and they are all actually Quranic names since their root is AIN-F-R which is used in the Quran.
Affrah could also refer to Afraah, which is a girl name meaning happiness, joy, excitement. This is a good and popular name for girls, and its root is Quranic.