Well, um...
...
Fine, I admit this is a placeholder for the day Eriol makes a cameo in Tsubasa RESERVoir CHRoNiCLE. Because I have faith. They wasted the perfect world for him, Rekort, but I still have faith. Clow had an alter, Fujitaka had an alter; we're only missing him! Hell, if even Yamazaki and Naoko made it to Tsubasa... I'm still crossing my fingers and my toes.
But on the meantime, there's some sort of namesake in CLAMPverse to mention about.
This is the school Misaki, Koutarou, Tamayo, and Hatoko study in. Its name is Eriol Academy, it's located in Tokyo, and it goes from kindergarten to high school. Particularly, I'm amused the school's symbol is a crown. (It fits my theory CLAMP was inspired in the Black Prince's Crown when they decided on Ruby and Spinel's names.)