It's an indirect Quranic name for both boys and girls. According to hadith (a saying of the Prophet, peace and blessings of Allah upon him) it is the gate of Paradise dedicated to those who fasted often in their lives. Rayyan is derived from the R-W-Y root, which means one who is satiated of water, who isnt thirsty.
Razinah or Razeenah is an Arabic name for girls that means dignified, composed. It is the name of a Sahabiyyah (RA), whose full name is not known. She was the freed slave of Safiyyah, wife of the Prophet, and also worked as a servant to the Prophet. She had a daughter by the name of Amatullah.
Razwaa is an indirect Quranic name for girls that is the name of a mountain in al-Madinah, city of the Prophet, peace and blessings of God upon him. It is derived from the R-DHAD-Y (contentment, attainment of Gods pleasure) root which is used in many places in the Quran.