When he (Damodara Svarupa) went to Varanasi, he took sannyasa from a sannyasi designated Tirtha. Although he received the title Svarupa in his brahmacari stage, he did not change his name when he took sannyasa

Expressions researched:
"When he went to Vārāṇasī, he took sannyāsa from a sannyāsī designated Tīrtha. Although he received the title Svarūpa in his brahmacārī stage, he did not change his name when he took sannyāsa"

Sri Caitanya-caritamrta

CC Madhya-lila

In the Vedic discipline there are ten names for sannyāsīs, and it is customary for a brahmacārī assisting a sannyāsī of the designation Tīrtha or Āśrama to receive the title Svarūpa. Dāmodara Svarūpa was formerly a resident of Navadvīpa, and his name was Puruṣottama Ācārya. When he went to Vārāṇasī, he took sannyāsa from a sannyāsī designated Tīrtha. Although he received the title Svarūpa in his brahmacārī stage, he did not change his name when he took sannyāsa.

CC Madhya 10.102, Translation and Purport

Svarūpa Dāmodara also arrived the next day. He was a very intimate friend of Śrī Caitanya Mahāprabhu’s, and he was an ocean of transcendental mellows.

“Svarūpa” is one of the names of a brahmacārī in Śaṅkarācārya’s disciplic succession. In the Vedic discipline there are ten names for sannyāsīs, and it is customary for a brahmacārī assisting a sannyāsī of the designation Tīrtha or Āśrama to receive the title Svarūpa. Dāmodara Svarūpa was formerly a resident of Navadvīpa, and his name was Puruṣottama Ācārya. When he went to Vārāṇasī, he took sannyāsa from a sannyāsī designated Tīrtha. Although he received the title Svarūpa in his brahmacārī stage, he did not change his name when he took sannyāsa. Actually as a sannyāsī he should have been called Tīrtha, but he chose to retain his original brahmacārī title of Svarūpa.