Meaning and name origin
Sine \s(i)-ne\ as a girl's name is of Irish and Hebrew origin, and the meaning of Sine is "God is gracious". Sine is a variant of Sheena (Irish): variant of Jane (Hebrew) "God's grace" or Jean. Also a variant of Sinead (Irish, Hebrew): variant of Jane or Janet, which are feminine forms of John.
Sine is not a popular first name for females but a very popular surname or last name for all people (#9901 out of 88799, Top 11%) (2000 U.S. Census).
Sine is also pronounced similarly to San, Sian and Zin. Other suggested similar baby names are Aine, Kine, Sana, Sena, Shaine, Shane, Shene, Shone, Siana, Siena, Signe, Sile, Sima, Sina, Sinnie, Sinny, Stine and Tine. These names tend to be more commonly used than Sine.