"Fourteen" (four and ten) would have been from "scoring numbers", where you get to twenty (a score), keep track of the scores separately, and start over. Up to twelve, we used a duodecimal/dozenal system (a separate word for each number). That was also common in other non-Germanic Indo-European languages, notably the Brythonic Celtic languages (and various versions of Brythonic scoring numbers are still used in parts of Britain, depending on the pre-English dialect spoken in the area and changes over time, especially in children's games). French numbering still shows signs of "scoring", especially in the 60/70 and even moreso in the 80/90 region.