October comes from the Latin octo, meaning “eight.” It has nothing to do with the number ten, despite being the tenth month in the modern calendar. The oct- prefix is familiar from octopus (eight legs), octagon (eight sides), octave (eight notes)—all of which correctly use the root. October is the outlier. October lies.
This is not a minor annoyance. It is a systematic confusion embedded in the everyday lives of two billion English speakers and learners. Every child who encounters October and already knows the word octopus will make the reasonable inference that October is the eighth month. They will be wrong. They will be corrected. And they will learn, at that moment, that the English calendar does not obey its own rules.
The September-October-November-December cluster is the clearest evidence that the English calendar needs reform. These four months are the only ones with transparent number roots, and all four are wrong. The learner who relies on etymology to navigate the calendar will fail four times out of four. The learner who gives up on logic and resorts to rote memorization will succeed, but only by accepting that the system is arbitrary.
Rote memorization of twelve opaque labels is a tax on everyone who learns English. It is a tax that Chinese, Japanese, Korean, and many other language communities do not pay. Their months are numbered. Their calendars are self-explanatory. English can be too.
Our Recommendation: Month Ten. Eight is eight. Ten is ten. Language should not confuse them.