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J. Djanrelian was a 22nd century member of Starfleet, one of the personnel listed on the dedication plaque of Enterprise NX-01. Djanrelian was listed in the group of names of representatives responsible for the vessel's flight testing. (Star Trek: Enterprise set artwork)
Djanrelian was named for production staff associate Jon Djanrelian. This name was seen on the Enterprise dedication plaque. There is another, later, member of the Federation's Starfleet also named for Djanrelian, indicating a possibility that "J. Djanrelian"'s first name is Jon, and/or that they might all be related. It has also been speculated that all of the 22nd century persons listed on the plaque were somehow extraordinarily long-lived, and could be the same as those who were credited on the later 24th century plaques.