National Alex Day circulates as an informal name-appreciation observance on holiday-calendar sites and social media, fixed to April 21. No primary record identifies who created it, when, or why that date was chosen.
The king who spread it
Alexander the Great was born in 356 BCE at Pella, in Macedonia. By the time he died in 323 BCE, his empire ran from Greece to Egypt to the edge of India. He was 33.
He planted his name as he went. In 332 BCE he founded a city in Egypt and called it Alexandria, after himself. It was one of many places and people that would carry it.


