Marily is of Latin origin, derived from the female given name Mary, which itself is a shortened form of Maria. The name means 'sea of bitter tears', a translation from the Latin 'Maria' and its Hebrew root 'Mariam'. It was popularized by prominent figures such as Mary, the mother of Jesus Christ in Christianity, and later by Mary Tudor, queen of England in the 16th century.
The name Marily experienced significant variation in popularity over the past century, with peak years being 1983 (19 births), 1997 (30 births), and 2005 (34 births). After a steady decline from the late 1950s to the early 1980s, it saw a resurgence in popularity during the late 1980s and early 1990s. However, since then, its popularity has gradually decreased, with fewer than 15 births recorded annually between 2013 and 2023, except for brief spikes in 2016 (15 births) and 2021 (10 births). Overall, the name Marily has been given to 858 newborns since 1930.