'apologizer' originates from Modern English, specifically from the verb 'apologize' with the agentive suffix '-er'. 'apologize' ultimately traces back to Greek 'apologia', where 'apo-' meant 'away' and 'logos' meant 'speech' or 'reason'.

'apologia' (Greek) passed into Latin and Old French as 'apologie' and into Middle English as 'apologie'. The verb form 'apologize' was formed in English (early modern period) from these roots, and the noun 'apologizer' developed by adding the English agent suffix '-er' to the verb.

Initially 'apologia' meant 'a speech in defense' (a formal defense). Over time, through use and semantic shift in English, 'apology' and 'apologize' came to commonly mean 'an expression of regret', and 'apologizer' now means 'one who expresses regret' or 'one who apologizes'.