English has special words until twelve. Until nineteen it follows a pattern. The few exceptions to that pattern also apply to the multiples of ten. twelve-twenty, thirteen-thirty, fifteen-fifty, and that's it. It could be much, much worse.

Twenty is special. That destroys the entire 20-29 series.

In Spanish, just 11 to 15.

In Greek only 11 and 12 are different, with 12 (δώδεκα = dodeka) being obvious to anyone who learned geometry.