Roddenberry was, of course, named after the creator of Star Trek, and leading member of the TOS production staff, Gene Roddenberry. G. Roddenberry may be related to or may even be the same person as E.W. Roddenberry, who was active in the same era.
In the original version of TNG: "Up The Long Ladder", Gene Roddenberry was listed as the commanding officer of the Earth starship VK Velikan in 2160. The ship was assigned to explore strange new worlds. This information appeared on an okudagram on Picard's desk monitor. A legible version of the original okudagram appeared in the reference book, Star Trek: The Next Generation - The Continuing Mission. For the remastered version, the captain of the Velikan was changed to Mike Volland and the mission to stellar chart mapping.