He was born at Shrinagar, a town within the erstwhile Porbandar State of Gujarat on 6 October 1901 to Rana Shri Shivsinhji Motiji Sahib Jethwa, a distant cousin of Maharaja Rana Sahib Natwarsinhji Bhavsinhji Jethwa, the ruling scion of Princely State of Porbanadar.
[citation needed] As, Rana Sahib Natwarsinhji Bhavsinhji had no male issue, he adopted Udaysinhji, as a son and heir-apparent to the throne of Porbandar on 12 June 1941.
In the same year, on 3 July 1941; Udaysinhji was married to Maharajkumari Shri Prem Kunverba Sahiba, daughter of H.H.
He started his career as Preventive Officer at Bombay Port Trust and Customs Department.
[3][2] He was awarded Padma Shri award by Government of India in year 1971, in field of Trade & Industry from the State of Gujarat as a recognition to his contribution in this field, especially for his contributions related to cooperative movement, agriculture trade and industry.