Oops, it doesn't look like 'get a different name day' is a national day..

Other days

polyamory

Polyamory Day
cat girl

Cat Girl Day
frozen yogurt

Frozen Yogurt Day
unicorn

Unicorn Day
get funky

Get Funky Day
youth

Youth Day
camera

Camera Day
book

Book Day
bow tie

Bow Tie Day
coffee

Coffee Day