Maris is a feminine given name of Latin origin meaning "of the sea". It is derived from the phrase Stella Maris ("star of the sea"), an epithet for the Virgin Mary. Maris is a feminine given name in the English speaking countries and in Estonia.
Mavis is a female given name. Its usage was initiated by Marie Corelli's 1895 novel The Sorrows of Satan which featured a character named Mavis Clare whose first name is said to be "rather odd" but suitable for Miss Clare as "she sings quite as sweetly as any thrush".