Bhai Dyala ji variously spelt as Bhai Dayala, Bhai Diala, , was one of the earliest martyrs to the Sikh faith. Along with his companions Bhai Mati Das and Bhai Sati Das as well as Ninth Guru, Guru Tegh Bahadur, Bhai Dayala was killed at Chandni Chowk at Delhi in November 1675.
According to Satbir Singh, Bhai Dayala was the brother of Bhai Mani Singh and belonged to village Kakaru in District Ambala, now in Haryana. The village is commonly called Theh. But according to Harbans Singh Thind, Bhai Dayala was born in village Kalhe in Majhades, District AMRITSAR, Tehsil Tarn Taran in a family of Kamboh farmers. The village Kalha adjoins village Kang and is located few miles east of Tarn Taran. His father Lall Chand was from Mutti clan of the Kamboj. His mothers name was Chandika. Sher Singh Sher writes that Bhai Dayala ji belonged to the Kambo or Kamboh caste and was a paternal uncle of Bhai Mani Singh . Another research scholar S Kirpal Singh states that Bhai Dayala was Kamboj but does not give any further information about his family or his village. A likely scenario is that Bhai Dayala belonged to those families of Kambohs which had earlier moved from Kambohwal and had settled at Anandpur in the service of the Gurughar during the times of ninth Guru.
Source: Wikipedia