1. Kāḷaka.– A millionaire (seṭṭhi) of Sāketa. His son was the husband of Cūḷa-Subhaddā (q.v.) and therefore son-in-law of Anāthapiṇḍika. Kāḷaka was a follower of the Nigaṇṭhā. When the Buddha visited Sāketa, at the request of Cūḷa-Subhaddā, Kālaka listened to his discourse and became a Stream-winner (sotāpanna). He gave his park, the Kāḷakārāma, to the Buddha, and built a vihāra there after removing, by force, the Nigaṇṭhā, who were in possession.
AA.ii.482 f; but see DhA.iii.465 f, where the millionaire’s name is given as Ugga of Uggapura; see also Dvy.402, where the name of the city is Puṇḍavardhana and that of Anāthapiṇḍika’s daughter Sumāgadhā.
2. Kāḷaka.– A general (senāpati) of King Yasapāṇi of Bārāṇasī, a previous birth of Devadatta. The story is given in the Dhammaddhaja Jātaka. J.ii.186 ﬀ.
3. Kāḷaka.– See Ayya-Kāḷaka.
4. Kāḷaka.– See A.v.164, Sutta No.lxxxvii. Is Kāḷaka here a proper name or a generic name (Kāḷaka-bhikkhu) meaning a wicked monk?
I am inclined to take it as the latter. See Kāḷaka Sutta.