沙门 transliterates 'Salmon-' — but the genus is named for the American veterinary scientist Daniel Elmer Salmon (1850-1914), not the fish.
氏 (shì, 'clan/family') marks it as a person-derived name, and
菌 (jūn, 'bacterium') is the genus suffix; many bacterial genera follow the same pattern, e.g.
大肠杆菌 (E. coli).
