What is "jackling"

Jackling is a surname which may refer to:

• Daniel C. Jackling (1869–1956), American mining and metallurgical engineer
• Sir Roger Jackling (diplomat) (1913–1986), British ambassador
• Sir Roger Jackling (born 1943), British civil servant
• Tom Jackling (c.1750–1797), English bare-knuckle boxer, ring name Tom Johnson