Sorrow

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Old English sorh, sorg (noun), sorgian (verb), of Germanic origin; related to Dutch zorg and German Sorge .

wiktionary

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From Middle English sorow, sorwe, from Old English sorg, from Proto-West Germanic *sorgu, from Proto-Germanic *surgō (compare West Frisian soarch, Dutch zorg, German Sorge, Danish, Swedish and Norwegian sorg), from Proto-Indo-European *swergʰ-(“watch over, worry; be ill, suffer”) (compare Old Irish serg(“sickness”), Tocharian B sark(“sickness”), Lithuanian sirgti(“be sick”), Sanskrit सूर्क्षति(sū́rkṣati, “worry”).

etymonline

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sorrow (n.)

Old English sorg "grief, regret, trouble, care, pain, anxiety," from Proto-Germanic *sorg- (source also of Old Saxon sorga, Old Norse sorg, Middle Dutch sorghe, Dutch zorg, Old High German soraga, German sorge, Gothic saurga), perhaps from PIE *swergh- "to worry, be sick" (source also of Sanskrit surksati "cares for," Lithuanian sergu, sirgti "to be sick," Old Church Slavonic sraga "sickness," Old Irish serg "sickness"). Not connected etymologically with sore (adj.) or sorry.

sorrow (v.)

Old English sorgian, from sorg (see sorrow (n.)). Related: Sorrowed; sorrowing. Compare Dutch zorgen, German sorgen, Gothic saurgan.