The name Mimir means He Who Remembers, The Wise One and is of Scandinavian origin. Mimir is a name that's been primarily used for boys.
From the Old Norse, Mimir is a figure in Norse mythology known for his knowledge and wisdom. He is beheaded during the war between the Vanir and the Æsir. Mimir has appeared as a girls name with a few bearers in Iceland recently, but is still primarily a male name. It is not in use in Scandinavia today.