Zulhijjah is an Arabic name for boys and girls that refers to the 12th month of Hijri calendar, in which the Hajj is performed. The name literally means [the month] in which the Hajj proceedings are performed.
Zumar is a direct Quranic name for boys and girls that means groups, throngs of people, companies, crowds. It refers to the groups of people that will be lead to the gates of Paradise when the Day of Judgment ends.
Zyan is an indirect Quranic name for boys and girls that means adornment, decoration, beautification, anything that makes something more beautiful. It is derived from the Z-Y-N root which is used in many places in the Quran.