A brahmin who once visited the Buddha, saying that he had been told by Sonakāyana that the Buddha preached the ineffectiveness of all deeds and asking if this were true. A.ii.232.
The Commentary explains (AA.ii.578; cf. Moliya ) that he was a brahmin of the Moggallānagotta and wore a large tuft (sikhā) on the crown of his head, hence his name.