The English word “geyser” comes from the name of the great geyser, Geysir in Haukadalur, South Iceland.
Due to the high rate of volcanic activity in Iceland, it is home to some famous geysers in the world. Geysers and hot springs are distributed all over the island. Many of the geysers are located in Haukadalur. Geysers are known to have existed in at least a dozen other areas on the island.

The Great Geysir, which first erupted in the 14th century, gave rise to the word geyser. By 1896, Geysir was almost dormant before an earthquake that year caused eruptions to begin again, occurring several times a day, but in 1916, eruptions all but ceased.

Source: https://en.wikipedia.org/wiki/Geyser