Source — Merriam-Webster, "hygge"

Extract

Defines the noun as "a cozy quality that makes a person feel content and comfortable"; the adjective form (hyggelig, anglicized) as describing something that invokes "a sense of coziness, contentment, and well-being."
First known use: noun form entered English use in 1960; adjective form in 1963. This is Merriam-Webster's own dating of first English use, independent of the word's 2016–17 popular wave and its 2017 formal addition to the Oxford English Dictionary (see the Local/OED source).
On origin: traces the word to Danish and Norwegian, ultimately Old Norse, connected to a verb meaning "to make comfortable," itself related to Germanic roots for thinking/mindfulness (e.g. Old English, Old High German cognates for mental states). Calls the ultimate source "uncertain."

Does not give a specific citation (e.g. a named 1960 English-language print source) for the "first known use" date — the date is asserted, not shown with the underlying citation.
Its etymology account is vaguer and less specific than Wiktionary's (no Proto-Germanic form given, no explicit "modern meaning taken over from Norwegian in the 19th century" claim); the two sources agree on the general Old Norse/Germanic lineage but Merriam-Webster does not corroborate or contradict Wiktionary's more specific 19th-century-reborrowing claim.