'astrologian' originates from Greek, specifically the word 'astrologia', where 'astron' meant 'star' and 'logia' meant 'study'.

'astrologian' changed from Medieval Latin forms (e.g. 'astrologianus') and Middle English usages derived from Latin/Old French roots and eventually became the modern English word 'astrologian'.

Initially, it meant 'one who studies or practices astrology'; over time this core meaning has largely remained, though the term is now relatively rare and often appears in literary, historical, or fictional/game contexts.