Grey

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Old English grǣg, of Germanic origin; related to Dutch grauw and German grau .

wiktionary

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From Middle English grey, from Old English grǣġ, from Proto-Germanic *grēwaz (compare Dutch grauw, German grau, Old Norse grár), from Proto-Indo-European *ǵʰreh₁-(“to green, to grow”) (compare Latin rāvus(“grey”), Old Church Slavonic зьрѭ(zĭrjǫ, “to see, to glance”), Russian зреть(zretʹ, “to watch, to look at”) (archaic), Lithuanian žeriù(“to shine”)).

etymonline

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grey

see gray.