In the anime, it is implied that Jerome drowns in the process of saving Weed. However, in the manga, Jerome survives this ordeal. Later on, he finds a mate (Ridia) and they have six pups (the series continues following the story of Weed's pups with Orion as the lead character).
John-San died in episode nine of Ginga Desetsu Weed.
No Gin does not die in the manga of Ginga Densetsu Weed it looked like Gin died by getting shot in book 2 but it was his substitute, Tokimune.
From Musashi on Ginga Board ~Yes he does in manga 59 afte being killed by the Hybrid bear. Ginga Densetsu Weed manga ended at volume 60.
Jerome Namias died in 1997.
Jerome of Pavia died in 787.
Jerome Zerbe died in 1988.
Jerome Xavier died in 1617.
Jerome Connor died in 1943.
Jerome Snyder died in 1976.
Jerome Lamy died in 1781.
Jerome Levine died in 2006.
Jerome Alden died in 1997.