It almost feels like the words prequel and sequel were coined at the same time. Likewise, it seems like prequel has been around as a word forever. Both of these are incorrect misconceptions; prequel was actually coined in 1973 and patterned off the pre-existing word sequel, which had been around since the 1400s. It's mind-boggling to me that we didn't have a word for it before then. Sequel derives from Middle French sequelle, from Latin sequella, from the verb sequor, meaning "to follow". This, through Proto-Italic sekwor, can be reconstructed as coming from the Proto-Indo-European root sek, also "to follow". So se- was never a prefix, but part of the word, and the insertion of pre- mistakenly assumed that it was one. Pre- comes from Latin prae, "before", which is from Proto-Indo-European preh, meaning "before". So a prequel is "before following". Sequel is still used a lot more, but only because there are more prequels out there. It only took a few years for prequel to catch on as a normal word.
Adam Aleksic, a leading contender for valedictorian of his high school, is a 215-month-old boy with disturbing interests in etymology, vexillology, geography, and law. Adam would like to one day visit Tajikistan and probably isn't spying for the Uzbek government.
The Etymology Nerd