Ajuma
Ajuma is an East African name (Swahili/Somali) derived from Arabic Jumu'ah (جمعة) and used for girls born on Friday.
No. Jumu'ah (جمعة) appears in the Qur'an as the term for Friday prayer, but Ajuma as a personal name is a cultural usage and not a Qur'anic proper name.
It is primarily an East African (Swahili and Somali) cultural name; outside those communities it is less common, hence its rarity.
Yes. The male/neutral day-name 'Juma' is widely used for boys in the same regions.
Common pronunciations include ah-JOO-mah; spellings vary regionally (Ajuma, Ajumah, Ajooma).