Holmian
Holmian is a term used as both a demonym and an adjective, generally associated with places named Holm or with communities that use Holm as a geographic root. The root Holm itself comes from Old Norse holmr, meaning "islet" or "island," and the suffix -ian forms adjectives and demonyms in English. Because Holm is a common place name in northern Europe, Holmian usage is not fixed and varies by context. In real-world geography, Holmian can appear informally to describe features, traditions, or identities linked to a specific Holm, but it is not an official or widely standardized demonym.
In literature and world-building, Holmian is more commonly encountered as the name of a fictional language,
Etymology and usage notes: Holmian derives from holmr plus -ian; the form mirrors other demonyms like "Icelander"