Delmar is of Germanic origin, derived from the Old German words 'dal' meaning valley and 'mar' referring to fame or famous. It was introduced to England by the Normans after the 1066 invasion and was once quite popular in medieval times. The name fell out of fashion in the 17th century but has seen a slight resurgence in recent years.
"Over a span of nearly five decades (1910-1957), the name Delmar was given to 134 newborns, with the number of births per year varying from 5 to 10. The peak years for this name's usage were 1924 and 1926, each with 9 births."