Thank you, Soon-to-be-determined
Some last names you probably should not pick: Doe, which is commonly used a a placeholder for unidentified people (e.g., John Doe); Smith and Jones, which are so common that people might assume you're giving them a fake name.
If you want to be anonymous on the web, picking both a common first and last name would make you very hard to find.
An Asian friend of mine with a difficult foreign name went by her initials -- I mean the initials of her first and middle name, plus her last name. Sort of like if JK Rowling were called JK by her friends.
Male: Lee, Tony, Neil, Sam, Miles Female: Ella, Lucy, Lisa, Emily, Sarah
last name could be anything really. Grey, Simmons, Wallace
im not terribly creative i know but its what id go with i think
or
Bobby Quine