Supplanter; also associated with luck or being fortunate.
Jammy is primarily a diminutive of James, which derives from the Hebrew name Jacob, meaning 'supplanter'. In British English slang, it also carries the colloquial meaning of being exceptionally lucky or fortunate. While rare as a formal given name, it is occasionally used as a playful or affectionate nickname.
English professional footballer often referred to by this nickname
Influential Jamaican dub and reggae producer
US births per 5-year period, 1990–present (SSA data).