Theft

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Old English thīefth, thēofth, of Germanic origin; related to thief.

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From Middle English theft, thefte, þefte, þefþe, þiefþe, from Old English þīefþu, from Proto-Germanic *þiubiþō, from *þeubaz(“thief”), equivalent to thief +‎ -th or thieve +‎ -th. Cognate with Old Frisian thiuvethe, thiufthe(“theft”), Old Norse þýfð, þýft, and (obsolete) Dutch diefte.

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theft (n.)

mid-13c., from Old English þeofð (West Saxon þiefð) "theft," from Proto-Germanic *theubitho (source also of Old Frisian thiufthe, Old Norse þyfð), from *theubaz "thief" (see thief) + abstract formative suffix *-itha (cognate with Latin -itatem; see -th (2)).