Who fixes a warship's official pronunciation?

Does the sponsor's pronunciation at launch permanently establish a ship's name?

Tradition suggests it should, but sponsors are normally coached and historical mistakes have sometimes been adapted afterward.

Tradition treats the name spoken at a launch as binding. The navy normally coaches the sponsor in its intended pronunciation before the ceremony. Sponsors have nevertheless ignored that guidance, and the resulting pronunciation has sometimes been adapted afterward. Established naval pronunciations can also differ sharply from ordinary usage.