Muhammad bin Amr bin Ata' (may Allah have mercy on him) said that Zaynab bint Umm Salamah (may Allah be pleased with them both) said: My name was Barrah, and the Messenger of Allah (peace and blessings be upon him) named me Zaynab. Zaynab bint Jahsh (may Allah be pleased with her) came to him (peace and blessings be upon him), and her name too was Barrah; the Messenger of Allah (peace and blessings be upon him) changed it and named her Zaynab.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19317