Old English weorþ "significant, valuable, of value; valued, appreciated, highly thought-of, deserving, meriting; honorable, noble, of high rank; suitable for, proper, fit, capable," from Proto-Germanic *wertha- "toward, opposite," hence "equivalent, worth" (source also of Old Frisian werth, Old Norse verðr, Dutch waard, Old High German werd, German wert, Gothic wairþs "worth, worthy"), which is of uncertain origin. Perhaps a derivative of PIE *wert- "to turn, wind," from root *wer- (2) "to turn, bend." Old Church Slavonic vredu, Lithuanian vertas "worth" are considered to be Germanic loan-words. From c. 1200 as "equivalent to, of the value of, valued at; having importance equal to; equal in power to."
"to come to be," now chiefly, if not solely, in the archaic expression woe worth the day, present subjunctive of Old English weorðan "to become, be, to befall," from Proto-Germanic *werthan "to become" (source also of Old Saxon, Old Dutch werthan, Old Norse verða, Old Frisian wertha, Old High German werdan, German werden, Gothic wairþan "to become"), literally "to turn into," from PIE root *wer- (2) "to turn, bend."
Old English weorþ "value, price, price paid; worth, worthiness, merit; equivalent value amount, monetary value," from worth (adj.). From c. 1200 as "excellence, nobility."