CC Madhya 1.184
rūpa, sākara-mallika āilā tomā’ dekhibāre
Śrī Nityānanda Prabhu and Haridāsa Ṭhākura told Lord Caitanya Mahāprabhu that two personalities — Śrī Rūpa and Sanātana — had come to see Him.
Sākara Mallika was the name of Sanātana Gosvāmī, and Dabira Khāsa was the name of Rūpa Gosvāmī. They were recognized by these names in the service of the Muslim king; therefore these are Muslim names. As officials, the brothers adopted all kinds of Muslim customs.