1). In Ireland on St. Patrick’s Day, people traditionally wear a small bunch of shamrocks on their jackets or caps. Children wear orange, white and green badges, and women and girls wear green ribbons in their hair.
2). 34 million Americans have Irish ancestry, according to the 2003 US Census. That’s almost nine times the population of Ireland, which has 4.1 million people.
3). The name “leprechaun” has several origins. It could be from the Irish Gaelic word “leipreachan,” which means “a kind of aqueous sprite.” Or, it could be from “leath bhrogan,” which means “shoemaker.”
Facts from: http://www.wsaw.com/seasonal/misc/40129602.html