Cynii is of Welsh origin, derived from the ancient Celtic name Cunedda. It means 'hound', reflecting its origins as a byname for a dog lover or hunter. The name gained prominence through King Cynfyn, also known as Cynddylan, who ruled in Mercia around 800 AD. In modern times, Cynii is often used as an alternative spelling to the more common Cynwyl, but it remains unique and distinctive.
"In 2007 alone, there were five babies named Cynii."