Family- father actor Sukumaran and mother Mallika Sukumaran, His elder brother Indrajith Sukumaran and sister-in-law Poornima Indrajith are also film actors. On 25 April 2011, Prithviraj married Supriya Menon, a BBC India Reporter, in a private ceremony at Palakkad.
Supriya is a very intellectual lady and Prithviraj was attracted towards this quality that she possesses. The couple dated for a year before marriage although Prithviraj always denied questions from the media of having affairs with a girl. They met each other after Prithviraj's film Raavan was released following which he was interviewed by Supriya and the two gradually fell deeply in love.
Early days:- Prithviraj was born in Thiruvananthapuram, Kerala, Prithviraj Sukumaran initial schooling was at St. Mary's Central School Poojappura, which was near his home at Chengallur,where he acted in various plays and skits for the school's annual day celebrations. He completed the rest of his school education at the Sainik School Kazhakoottam, Thiruvananthapuram and Bharathiya Vidya Bhavan, Thiruvananthapuram.
Tamil and Telugu Cinema - Prithviraj made his Tamil debut through Kana Kandaen in 2005 as the suave and sophisticated villain. Soon he got the opportunity to act under the direction of Bhagyaraj in the film Parijatham.
Bhagyaraj said in an interview, "The entire media unanimously appreciated Prithviraj in Kana Kandaen, so it was with that confidence that I signed him". In 2007, Prithviraj co-starred with Tamil actress Jyothika in her last film, Mozhi which went on to become a huge hit. He also starred in Satham Podathey and Kannamoochi Yenada in the same year.
In 2008, Prithviraj starred in Vellithirai, the Tamil remake of Udayananu Tharam. Rediff described his performance: “Prithviraj makes the best of his assets – his expressive eyes, which glint in fury, soften with love, or brim over with frustrated tears”.
The Tamil remake of Classmates, titled Ninaithale Inikkum, was released in 2009. His last release in Tamil was Mani Ratnam's Raavanan in 2010, co-starring Vikram and Aishwarya Rai.It met with only moderate critical success. Nevertheless, his performance was critically acclaimed.