Dutch language
The Dutch language was a language spoken on Earth, most commonly by the Dutch and in the Netherlands and Belgium.

An early map of the Earth contained several several Dutch names for Pacific Ocean islands, as well as some other annotations in Dutch. Examples include "Honden E." (island of the dogs) and "E. zonder gront" (archaic; island without ground). ( opening credits)
 

In 2024, Chris Brynner asked Jadzia Dax if her first name was Dutch in origin. She didn't elaborate. ()

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Earth languages