Osmar is of German origin, derived from the Germanic elements 'os' meaning 'god' and 'mari', referring to the sea or a great lake. The name Osmar was popularized by the 19th-century French poet and composer, Ernest осмар Barrias, who used it as a pseudonym. It has since gained international recognition but remains relatively uncommon, adding to its uniqueness.
The name Osmar experienced a steady increase in popularity from the late 1980s to the mid-2000s, peaking in 2005 with 111 births. Since then, its prevalence has somewhat decreased but remained stable, with around 40 to 70 births annually between 2016 and 2023.