holt comes from Old English holt ('wood, forest, grove'), from Proto-Germanic *hultą ('wood'), from Proto-Indo-European *kl̥dó- ('to strike, cut'). The sense 'otter's den' is a separate later development. The history explains the modern form through the named earlier word or formation, without requiring a separate speculative ancestry. In present English, the noun sense is "a small wood or copse; also an otter's den (archaic, dialectal)", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as wold. Its semantic neighborhood includes copse, grove, thicket, and wood, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Old English holt, Proto-Germanic *hultą, and Proto-Indo-European *kl̥dó-.