Step 1 : Introduction to the question "What is Cookie Monster's real first name?"
...Cookie Monster's love of cookies is legendary. The beloved Sesame Street character proudly proclaimed in song that, "C is for cookie, that's good enough for me." Simply called "Cookie" by his close friends, that isn't the name you'd find on Cookie's birth certificate. In fact, Cookie Monster's real first name is Sid. It seems that most fictional characters have complete names, even if they are culturally known more by a nickname or other popular moniker. Source: SmithsonianMag.com