'occult-related' is a compound of 'occult' and 'related'. 'occult' originates from Latin, specifically the word 'occultus', where 'occultus' meant 'hidden' or 'secret'. 'related' originates from Latin, specifically the word 'relatus', the past participle of 'referre', where 're-' meant 'back' and 'ferre' meant 'to carry.'

'occult' entered English from Latin 'occultus' (with Old French/Late Latin influence) and became the English word 'occult'. 'related' developed from Latin 'relatus' via Old French and Middle English forms (e.g. 'relater/relaten') into the modern adjective 'related'.

Initially, 'occult' meant 'hidden' or 'secret'; over time it acquired the specific sense of hidden knowledge or supernatural matters (the modern sense 'occult'). 'related' originally had the literal sense 'brought back' (as a past participle of 'referre') but evolved to mean 'connected' or 'having a relationship', which is its current adjectival use.