Why are many characters in Japanese anime named after warships?

The old Japanese joint fleet,

Battleships are named after ancient countries.

Combat cruisers/heavy cruisers are named after mountains.

This light cruiser is named after this river.

Aircraft carriers are named after adjectives or verbs with birds.

The first-class destroyer is named after the meteorological solar terms.

The second-class destroyer is named after plants.

Japanese surnames and first names also use land names and mountain names, so it is not people who name warships, but people and warships are named after ancient countries and mountains and rivers.

Attach a map of ancient Japan to see if there are many names you are familiar with.