Meaning unknown. It has been in use since the 19th century. It is possibly related to the name of the African tribe that lives largely in South Africa, the Zulus. In the 19th century the Zulus were a powerful nation under their leader Shaka.
Possibly means "brilliant beauty" in Persian. According to medieval legends this was the name of Potiphar's wife in the Bible. She has been a frequent subject of poems and tales.
Means "my rock is God" in Hebrew. In the Old Testament this name is borne by a chief of the Merarite Levites at the time of the Exodus.
From Lithuanian žydra
meaning "light blue" (using the patronymic suffix ūnas