Commander J'rak of the House of Kamril, was a Klingon warrior in service to the Imperial Klingon Defense Force in the late 24th century.
As an infant residing on Qo'noS in the mid-2340s decade, J'rak heard of his relatives, including grandfather Kamril, his cousin Morgar and his wife, Vaga, who had served in the defense of Narendra III during an attack by the Romulans. For the rest of his life, J'rak would tell the tale of those family members who perished at Narendra to any of his colleagues.
In an alternate timeline where the Cardassians did not withdraw from Bajor, J'rak was serving as commanding officer of No'Var Outpost, along the Klingon-Romulan border, by 2373. In this year, J'rak successfully commanded the outpost as it fought off an attack by a Romulan warbird. Unfortunately, J'rak perished along with the rest of his crew as the outpost's reactor exploded. (ST - Myriad Universes novel: A Gutted World)