From Rudolph +‎ -y.

Rudy

A diminutive of the male given name Rudolph.
- 2018 June 3, Veronica Stracqualursi and Dana Bash, “Giuliani to HuffPost: Trump could have ‘shot James Comey’ and not be prosecuted”, in CNN‎:
  Donald Trump’s lawyer Rudy Giuliani claimed Sunday that the President hypothetically could have shot the former FBI director to end the Russia investigation and not face prosecution for it while in office.
A surname.

Rudy (plural Rudys)

(UK slang, historical) A rude boy; a member of a Jamaican street gang in the 1960s and 70s.
- 1967, Dandy Livingstone, “A Message to You Rudy”:
  Stop your running around / Making problems in town / Rudy, a message to you, Rudy
- 1970 March 29, Nik Cohn, “England's New Teen Style Is Violence”, in The New York Times‎, →ISSN:
  They dance the West Indian Reggae because it is the only old‐fashioned dance beat around and the total opposite of Pepsi‐Rock, the Plastic Ono Band and Jethro Tull and Blood, Sweat & Tears, all of which they naturally despise; and they also have a wary respect for West Indians in general and the Rudys in particular, the Jamaican street gangs who are older and tougher then^[sic] themselves.

English

Polish