Janne is of Finnish origin and has been traditionally used as both a male and female given name in Finland. It is derived from the Old Norse name Johannes, which means "God is gracious." In some cases, Janne can also be a diminutive form of other names like Johann, Johannes, or Johanneska. The name gained popularity during the Middle Ages when it was used to honor Saint John the Baptist and Saint John the Evangelist. Today, Janne remains a popular choice among Finnish parents, but its usage has declined slightly in recent years compared to its peak in the mid-20th century.
"The name Janne experienced its peak popularity between the mid-1940s to late-1950s with a high of 21 births in 1951. However, it became less common after the 1960s, with only occasional years having more than 10 births."