The Welsh household spirit listed as a brownie variant is the Bwbach. Its plural form is Bwbachod, and Welsh folklore describes it as a domestic spirit that can be industrious, mischievous, and quick-tempered.
Like brownies in English and Scottish tradition, a Bwbach is associated with household work performed at night. Welsh accounts describe it helping with chores in exchange for a small offering, commonly cream left near the hearth. It is generally helpful when treated respectfully but may play disruptive tricks when offended.
The figure has a long folkloric history. The 12th-century Welsh historian Gerald of Wales recorded a Bwbach that caused trouble for a household after being angered. In the 19th century, folklorist Wirt Sikes described the Bwbach as a good-natured goblin who worked for Welsh maids.
Bwbach should not be confused with a selkie, which is a seal-being from northern European folklore, or with a kelpie, a dangerous water spirit. A redcap is another kind of goblin, traditionally associated with the Anglo-Scottish Border.