The toponym replaces the provisional name "Alberto" and was approved by the Geographic Coordinating Committee (Argentina) in 1956.

It memorializes Argentine naval hero Captain Enrique Sinclair (1805–1904).

Born in New York City, U.S., he emigrated while very young to the Rio de la Plata, joined the Argentine navy and fought at the side of Admiral William Brown in the war with Brazil.

This article incorporates public domain material from "Sinclair Island (Antarctica)".

This Wilhelm Archipelago location article is a stub.