Kärdla..This is the main town in Hiiumaa and probably existed already in the 14th century, but the oldest and still preserved written note date back to the year 1564. Before Kärdla got its city rights at the beginning of 1938, it was quite famous as a factory settlement. Kertil, Kärtellby, Kertel, etc are the better known of its older names. Some family names hark back to its first residents, the Swedes. The name Kärdla comes from the Swedish language and means a swampy, wet valley.