More can be written, but you might like to see "the last four months of the year all have incorrect numerical prefixes. SEPTember OCTober NOVember DECember, but they are not the 7th,8th,9th,or 10th month. is there a historical reason for this?" , with answers by /u/CranberryBogMonster , /u/Algernon_Asimov , and /u/swuboo .

This is not to discourage discussion. More questions, data, and debate are welcome.