Dannan is of Irish origin, derived from the ancient Gaelic name 'Donnán'. It translates to 'brown' or 'dark'. Historically, it was often used as a personal name, but today it also serves as a surname. The name Dannan gained popularity in English-speaking countries during the 20th century, likely due to its unique sound and Irish heritage.
"The name Dannan experienced a steady decline in popularity from 2006 to 2009, with the peak year being 2006 when it was given to 10 newborns."