Kalak (कलक) is a gotra of Jats.
Mention by Panini
After a long span of time, it was in the 9th, 7th and 2nd centuries B.C. that powerful hordes of the Scythians, known as Yueh-Chih (Gat or Gut or Gutian in archaic Chinese) uprooted the Sakas from the Jaxartes and they moved to Seistan in the South-West101. It was in Seistan that the Sakas received an invitation from an Indian Jain Patnarch, Acharya Kalak to invade India, for he wanted to avenge himself on Gardabhilla, the king of Ujjayini, who had seduced his sister, a pretty nun102. With the Yueh-chih on their heels and fresh encounters with their Parthian kings from north eastern Iran, the Sakas, sensing their stay in Seistan becoming hazardous, readily accepted the invitation of Kalaka. 
Ram Sarup Joon  writes ...Bahik, Bahi, Bahin or Bahela: Bahik Jats is found both among the Hindu and Sikhs. In Pakistan there are Muslim Bahele Jats-, Bahiks are mentioned in Mahabharat also. According to "Karna Parva", chapter of the Mahabharat) King Shalya paid l/6th part of his income to the Bahiks. According to Nandlal Dey, Bahik are a sub branch of the Madraks. Arat in district Sheikhupura was their capital. Hashak, Karmabh Kalak and Karkar were their important towns. In Daurala (District Meerut, U.P.) the Bahiyan Jats have six villages.
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