Errin is of Irish origin, derived from the ancient word 'oir', meaning 'west'. It was traditionally used as a surname, but has since been adopted as a given name for both boys and girls in some regions. The name gained popularity in the United States during the 20th century.
"The name Errin peaked in popularity between 1968 and 1976 with over 14 births per year. However, it's important to note that these statistics only represent a small number of years up until 2010."