Alas

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Middle English: from Old French a las, a lasse, from a ‘ah’ + las(se ) (from Latin lassus ‘weary’).

wiktionary

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From Middle English alas, from Old French a las (French hélas), from a(“ah”) + las, from Latin lassus(“weary”). Compare Dutch helaas, North Frisian ielas, West Frisian eilaas.

From Yakut алаас(alaas).

etymonline

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alas (interj.)

mid-13c., from Old French ha, las (later French hélas), from ha "ah" + las "unfortunate," originally "tired, weary," from Latin lassus "weary" (from PIE root *‌‌lē- "to let go, slacken"). At first an expression of weariness rather than woe.