Othmar is an ancient Germanic given name derived from the Old High German elements "adal" meaning "noble" and "hari" which means "army". It was popularized by Saint Othmar, a 9th-century monk who founded the Benedictine monastery at St. Gall in Switzerland. Over time, Othmar has become more commonly used in Switzerland and Austria rather than Germany. The name's popularity peaked during the mid-20th century but has since declined. It is typically pronounced /ˈoːtmaʁ/ or /ˈotmaʁ/, with stress on the first syllable. Variations of Othmar include Otmar, both used primarily in German-speaking countries.
Over the course of two decades (1912-1932), the name Othmar saw a peak in popularity with 19 births recorded in both 1916 and 1921. However, it appears that by the late 1920s and early 1930s, the name's appeal had waned, as the number of annual births fell to single digits. Overall, there were a total of 188 babies named Othmar during this period.