Grab

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late 16th century: from Middle Low German and Middle Dutch grabben ; perhaps related to grip, gripe, and grope.

wiktionary

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From Middle Dutch grabben(“to grab”) or Middle Low German grabben(“to snap”), from Proto-Germanic *grab-, from Proto-Indo-European *gʰrebʰ- (compare Sanskrit गृह्णाति(gṛhṇā́ti), गृभ्णाति(gṛbhṇā́ti, “he seizes”), Avestan 𐬔𐬀𐬭𐬆𐬡‎ (garəβ, “to seize”)). Cognate with Danish grabbe(“to grab”), Swedish grabba(“to grab”), Old English ġegræppian(“to seize”), Middle English grappen(“to feel with the hands; grope”), Macedonian грабне(grabne, “to snatch”), Bulgarian грабвам(grabvam, “to snatch”).

Arabic and Hindighurb?: crow, raven, a kind of Arab ship. This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.

etymonline

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grab (v.)

"seize forcibly or roughly," 1580s, from Middle Dutch or Middle Low German grabben "to grab," from Proto-Germanic *grab-, *grap- (source also of Old English græppian "to seize," Old Saxon garva, Old High German garba "sheaf," literally "that which is gathered up together"), from PIE *ghrebh- (1) "to seize, reach" (source also of Sanskrit grbhnati "seizes," Old Persian grab- "seize" as possession or prisoner, Old Church Slavonic grabiti "to seize, rob," Lithuanian grėbti "to rake"). Sense of "to get by unscrupulous methods" was reinforced by grab game, a kind of swindle, attested from 1846. Related: Grabbed; grabbing.

grab (n.)

1777, "thing grabbed;" 1824, "act of grabbing, a sudden grasp or seizing" from grab (v.). Up for grabs attested from 1945 in jive talk.