Jasmine flower or God is gracious
Shamaine is a modern variant likely derived from the French name Charmaine or a creative blend of Sh- prefixes with the name Elaine or Jane. It is often associated with the Persian-derived Jasmine flower or the Hebrew meaning of 'God is gracious' through its phonetic similarities to Jane.
Less common today
Shamaine isn't in the latest US Top 1000. It last peaked at #7,742 in 1992.
US births per 5-year period, 1990βpresent (SSA data).