Who was the last official Commodore for each navy?
Short answerThere is no single answer because navies retained or revived Commodore differently, and the title outlasted the Age of Sail in several services.
NotesThe answer depends on which navy and which meaning of Commodore is being used. The Dutch retained it as a substantive grade, while Royal Navy officers continued to command formations under the title after steam and iron warships appeared. The United States also reused Commodore in several forms across its history. These overlapping practices make a single 'last official Commodore' impossible without first defining the service, legal status, and period.