Green’s Dictionary of Slang

Ned n.

[generic uses of proper name]

1. [late 17C–1960s] the Devil (cf. old Ned under old adj.).

2. [mid-19C] (Aus.) a fool.

3. [1910s] (Aus.) a term of address to a stranger.

In phrases

raise Ned (v.) (also ...merry Ned, ...old Ned, ...promiscuous Ned, ...Harry, ...Old Nick)

[mid-19C+] to cause a disturbance, to make trouble.