Leanner is of Scandinavian origin, derived from Old Norse elements 'leikr' meaning 'playful' and 'heri' signifying 'army'. It's a unisex name, although it's more commonly used for females. Leanner gained prominence in the late 20th century but remains relatively rare, adding to its uniqueness.
The name Leanner had a peak of popularity in 1900 with five babies being named Leanner that year, but overall it remains quite rare with only five instances recorded annually.