Trennan is a male name with origins that can be traced back to the United States. It is pronounced as TREN-an (/ˈtrɛn.ən/). The name has a few variations, such as Trennen. Although not very common, Trennan has been given to a small number of newborn boys in recent years in the United States. While it may not have a specific meaning associated with it, Trennan exudes a strong and unique quality that is sure to make your child stand out.