Brennen is an intriguing name of Irish origin, derived from the Irish surname 'Ó Braonáin'. It is believed to have been introduced to England during the Norman Conquest and has since become a unisex given name, though it's more commonly used for males. The name Brennen is composed of two elements: 'bro', meaning 'marsh' or 'moor', and '-en', which denotes a personal name. Thus, Brennen could be interpreted as 'of the marsh'. In recent years, Brennen has gained popularity in English-speaking countries, perhaps due to its unique sound and Irish heritage.
The name Brennen experienced a steady increase in popularity from 1976 to its peak in 2007, with 17 births that year. However, it has since declined, with only 5 births recorded each year between 2013 and 2014. Overall, there have been 178 babies named Brennen from 1976 to 2014.