Aygul can also sometimes be used as a masculine name. However, it's more common for females. So, I think that the "Gender" of this name should be changed from "Feminine" to "Feminine & Masculine".
Also a Kazakh name spelled as "Айгүл" in Kazakh Cyrillic and "ايگۇل" in Kazakh Arabic.- https://kk.wikipedia.org/wiki/Айгүл_Серікқұлқызы_Иманбаева (in Kazakh; Aygul Imanbaeva) - https://kk.wikipedia.org/wiki/Айгүл_Нариманқызы_Үлкенбаева (in Kazakh; Aygul Ulkenbaeva).