The name Brettley is of English origin, derived from the old English words 'brēoþ' meaning broad and 'lēah' signifying clearing or meadow. It was traditionally a surname before becoming used as a given name in recent times.
The name Brettley experienced a peak in popularity between 2013 and 2014 with ten births each year, but has since declined, with only five births recorded in both 2016 and 2018. Over the six-year period from 2012 to 2018, there were a total of 48 babies named Brettley.