'livestock' originates from Old English, specifically the word 'līf' meaning 'life' and 'stoc' meaning 'place' or 'stock'. 'Related' comes from Latin 'relatus', the past participle of 'referre', meaning 'to bring back'.

'livestock' evolved from the Old English 'līf' and 'stoc', while 'related' transformed from the Latin 'relatus' through Old French 'relier', eventually becoming the modern English 'related'.

Initially, 'livestock' referred to 'living stock or animals', and 'related' meant 'connected or associated'. These meanings have largely remained the same in modern usage.