Ibn 'Abbas said that Juwayriyya's name had been Barra and the Prophet ﷺ had renamed her Juwayriyya.

أَنَّ اسْمَ جُوَيْرِيَةَ كَانَ بَرَّةَ فَسَمَّاهَا النَّبِيُّ ﷺ جُوَيْرِيَةَ

Abu Hurayra said, "Maymuna's name was Barra and then the Prophet ﷺ renamed her Maymuna."

عَنْ أَبِي هُرَيْرَةَ قَالَ كَانَ اسْمُ مَيْمُونَةَ بَرَّةَ فَسَمَّاهَا النَّبِيُّ ﷺ مَيْمُونَةَ