Lyanne is of Welsh origin and means "dark-haired." It is a variant spelling of the name Llanwen, which consists of the elements "llan" meaning "enclosed place" or "monastery," and "gwen" meaning "blessed" or "fair." Lyanne was popular in Wales during the Middle Ages but has since become more widely used around the world. It is often associated with the Welsh prince Owain Glyndŵr, who had a daughter named Llanwen. The name Lyanne is considered unique and exotic, yet it maintains a certain familiarity due to its connection to well-known Welsh names like Gwen and Llana.
The name Lyanne appears to have gained popularity around the late 1980s and peaked in the early 1990s with a significant increase in births recorded in 1990 (35) and 1991 (97). After this peak, there was a steady decline until it stabilized at an average of around 5-7 births per year from the late 1990s onwards.