Meaning of Law’s name

Law’s full name, Trafalgar D. Water Law, consists of two great battles, The Battle of Trafalgar and Waterloo, which cost Napoleon his emperorship. One of the mentioned battles destroyed his coalition with Spain.

The Battle of Trafalgar and Waterloo  ≈ Trafalgar Law

Napoleon ≈ Doflamingo

Spain ≈ Kaido