John Hancock, for one

• John Hancock, notably
• One of the Declaration's 56
• John Hancock, in a notable role
• Dotted-line user
• John Hancock writer
• Contract principal
• One of the Declaration of Independence's 56

Wiktionary Word definitions in Wiktionary
n. One who signs a contract, especially in athletic contexts

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1953, from sign (v.) + -ee .