It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the name of Sayyidah Juwayriyyah (may Allah be pleased with her) was "Barrah", but the Prophet (peace and blessings be upon him) changed her name to Juwayriyyah.
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2900
Hadith Gradingحکم دارالسلام:صحيح، وهذا إسناد حسن، م: 2140