The Pythagorean theorem is often cited as an element of Euclidean geometry. However, not only does the Pythagorean theorem predate Pythagoras, but geometry also predates Euclid. In fact, both go back in places like Babylon, Egypt, and the Indus River Valley about as far before Pythagoras and Euclid as they are before the present time.
Today, students from those places routinely learn and refer to mathematical concepts based on language formalized by European Enlightenment scholars some four or five millennia after their own ancestors were speaking about those same topics in other languages, associating discoveries with different people, and using different sets of symbols.
This is history. There is nothing wrong with examining the historical events that led to the state of mathematics today. That certainly beats being deliberately ignorant about it.