Are
late 18th century: from French, from Latin area (see area).
wiktionary
From Middle English aren, from Old English earun, earon(“are”), reinforced by Old Norse plural forms in er- (displacing alternative Old English sind and bēoþ), from Proto-Germanic *arun(“(they) are”), from Proto-Germanic *esi/ *izi (a form of Proto-Germanic *wesaną(“to be”)), from Proto-Indo-European *h₁ésti(“is”). Cognate with Old Norse eru(“(they) are”) (> Icelandic eru(“(they) are”), Swedish är(“(they) are”), Danish er(“(they) are”)), Old English eart(“(thou) art”). More at art.
From French are.
From Middle English are, ore, ōr, from Old English ār(“honor, worth, dignity, glory, respect, reverence, grace, favor, prosperity, benefit, help, mercy, pity, privilege”), from Proto-West Germanic *aiʀu, from Proto-Germanic *aizō(“respect, honour”), from *ais-(“to honour, respect, revere”). Cognate with Dutch eer(“honour, credit”), German Ehre(“honour, glory”).
etymonline
are (v.)
present plural indicative of be (q.v.), from Old English earun (Mercian), aron (Northumbrian), from Proto-Germanic *ar-, probably a variant of PIE *es- "to be" (see am). Also from Old Norse cognates.
In 17c. it began to replace be, ben as first person plural present indicative in standard English. The only non-dialectal survival of be in this sense is the powers that be. But in southwest England, we be (in Devonshire us be) remains non-standard idiom as a contradictory positive ("You people aren't speaking correct English." "Oh, yes we be!"), and we be has reappeared in African-American vernacular.
are (n.)
metric unit of square measure, 10 meters on each side (100 square meters), 1819, from French, formed 1795 by decree of the French National Convention, from Latin area "vacant piece of ground" (see area).
