'atypically-arranged' originates from the prefix 'a-' meaning 'not' and 'typical' from Greek 'typikos', meaning 'conforming to a type', combined with 'arranged' from Old French 'arranger', meaning 'to set in order'.

'atypically-arranged' evolved from the combination of 'atypical' and 'arranged', reflecting a non-standard order or pattern.

Initially, it meant 'not arranged in a standard way', and this meaning has largely remained the same in modern usage.