Originating from Old German roots, 'Thelmer' is a unique and historic given name. It's comprised of two elements: 'þeod', meaning 'people' or 'nation', and 'helm', translating to 'helmet'. Thus, Thelmer could be interpreted as 'warrior' or 'leader of the people'. This name has not been widely used in recent centuries, making it quite distinctive today.
The name Thelmer experienced fluctuations in popularity between 1910 and 1938, with a peak of 13 births in 1915 and a consistent decrease afterwards, reaching as low as 5 births per year from 1927 onwards. Despite the decline, the name still maintained some consistency, with at least one birth each year until 1938, totaling 142 births over this period.