Her name was Barrah, and the Prophet ﷺ named her Zaynab.
حدثنا يحيى عن شعبة قال حدثني عطاء بن أبي ميمونة عن أبي رافع
كان اسم زينب برة فسماها النبي ﷺ زينب
No references are available.
Its isnad is sahih. Bukhari reported it, 10/575, no. 6292, in the Book of Manners, chapter on changing names, and Muslim, 3/1687, no. 2141, in the Book of Manners, chapter on the recommendation of changing an ugly name, and likewise Abu Dawud, 4/288, no. 4953, and Ibn Majah, 2/1330, no. 3732, with a similar wording, and Darimi, 2/381, in the Book of Seeking Permission, chapter on changing names, with the same wording, no. 2698.