Pirjo is a diminutive of Piritta, itself a Finnish form of Bridget. Bridget originates in Irish language and means "powerful, strong". Bridget was the name of several saints, as well as a goddess in Celtic mythology. Until today, it is mainly popular in Ireland, in the United States its usage declines. The name was popularized by the character Bridget Jones, in the novel and subsequent film Bridget Jones's Diary, starring Renee Zellweger.