Erdman is an uncommon, distinctively masculine given name of German origin. It is derived from the Old High German elements 'erth' meaning 'earth' and 'mann', translating to 'earth man'. The name was likely used in reference to someone who worked the land or was particularly strong and steadfast, much like the earth itself.
"The name Erdman was not particularly popular during the first half of the 20th century, with only 26 recorded births between 1917 and 1928."