Tegan is an Irish surname and given name that has been used more frequently as a female given name since the late 20th century. It is derived from the Irish surname Ó Tadhg, which means 'descendant of Tadhg.' Tadhg itself comes from the Old Irish name Tadc, meaning 'poet.'
The name Tegan experienced a significant rise in popularity between the late 1980s and early 2000s, with a peak of 202 births in 2007. Since then, its usage has steadily declined, reaching a recent low of 57 births in both 2022 and 2023. Overall, Tegan has been given to a total of 2470 babies over the period from 1984 to 2023.