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Baba Deep Singh Ji were a Gurm Jatt
Baba Deep Singh Ji were born in village Gurm near Dehlon, Ludhiana. Baba Ji's Father died in a Battle against the Pathans. So Baba Ji's Mother took him to her native Village Pahuwind. Ref. Jattan Dian 101 Gottan Da Itehas

Baba Deep Singh (1682-1757) is revered among Sikhs as one of the most hallowed martyrs in Sikhism and as a highly religious person. He is remembered for his sacrifice and devotion to the teachings of the Sikh Gurus. The term Baba is used to show respect to an elder in India.

Tradition has it that Deep Singh continued to fight after having been decapitated, slaying his enemies with his head in one hand and his Khanda (double-edged sword) in the other.

There are two traditions. One tradition states that Baba Deep Singh was decapitated and continued to fight. The other tradition is that he suffered a severe gash to his neck which made it appear as if he had been decapitated, but he continued to fight on. We need references for both accounts.

http://www.sikh-history.com/sikhhist/warriors/deep.html