Heirloom

google

ref

late Middle English: from heir + loom1 (which formerly had the senses ‘tool, heirloom’).

wiktionary

ref

From Middle English heirlome(“heirloom”, literally “a tool or article passed to one's heirs”), equivalent to heir +‎ loom.

etymonline

ref

heirloom (n.)

early 15c., ayre lome, a hybrid from heir + loom (n.) in its original but now otherwise obsolete sense of "implement, tool," extended to mean "article." Technically, some piece of property that by will or custom passes down with the real estate. General sense of "anything handed down from generation to generation" is from 1610s.