CC Ādi 6.26

mahā-viṣṇura aṁśa — advaita guṇa-dhāma
īśvare abheda, teñi ‘advaita’ pūrṇa nāma
Word for word: 
mahā-viṣṇura — of Lord Mahā-Viṣṇu; aṁśa — part; advaita — Advaita Ācārya; guṇa-dhāma — reservoir of all attributes; īśvare — from the Lord; abheda — nondifferent; teñi — therefore; advaita — nondifferent; pūrṇa nāma — full name.
Translation: 
Śrī Advaita, who is a reservoir of virtues, is the main limb of Mahā-Viṣṇu. His full name is Advaita, for He is identical in all respects with that Lord.