Zayn (pronounced ZANE) is the seventh letter of many Semitic abjads, including Phoenician, Aramaic, Hebrew Syriac, and Arabic alphabet. The letter is called zayn and is written is several ways depending in its position in the word.
Zayn is also a masculine Arabic name which means "Beauty and Grace." Zayn refers to inner beauty not external beauty. It can be the first name for a boy or a surname. It is a very common name among people of Middle Eastern and North African descent.
Hajji Zayn al-‘Attar, was a 14th century Persian physician.
Ali ibn Husayn the fourth Shi'a Imam (659-713 AD) was nick named "Zayn al-Abidin" (Beauty of the Worshippers).