Jaik was born at Sänna Manor in Rõuge Parish, Võru County. He took part in the Estonian War of Independence. In 1920s and 1930s, he lived in Tallinn, working as a journalist and as a clerk. From 1936 to 1940, he was a consultant for the Ministry of Education. During World War II, he escaped to Sweden. He died in Stora Malm Parish, Katrineholm Municipality in 1948. In 1990, his ashes were returned to Estonia and interred at Rahumäe Cemetery in the Nõmme district of Tallinn.
- 1924 poetry collection "Rõuge kiriku kell" ('The Bell of the Rõuge Church')
- 1924-1933: story "Võrumaa jutud I-II" ('Tales from Võrumaa' I-II)
- 1999 (posthumously): "Tiroliaana" ('Tiroliana')
- Vabar, Sven. "Juhan Jaik". sisu.ut.ee. Retrieved 17 January 2021.
- "Jaik, Juhan (13. I. 1899 Võrumaa Sänna – 10. XII 1948 St. Malm)". Võrumaa Keskraamatukogu (in Estonian). Retrieved 17 January 2021.