Trevor is of Irish origin, derived from the Old Welsh name Trēfrig, which translates to "town near the river Trefriw". It gained prominence during the Middle Ages when it was brought to Ireland by settlers from Wales. The name Trevor reached its peak popularity in the United States during the mid-20th century and remains a beloved choice among parents today. It has also been used as a surname, with notable bearers including Canadian politician Trevor Eggleton and American football coach Trevor Moawad.
Over the span of 63 years, from 1951 to 2014, there were a total of 611 babies named Trevor born annually in various years, with peaks reaching as high as 26 births in 1987 and troughs as low as 5 births in multiple years.