It is not one of the common ones but I wonder if someone used it and just put it in as a clue which would mean that it's completely compromised...
A rainbow table would probably be more accurate than a password set that comes up on google.
no, you have known plain text, so you just have to encrypt your password using the same algorithm and then search the database for matching ciphertext, there's no need to find the clear text for any of the passwords.
you can't re-encrypt since we don't have the keys. but you can search for your e-mail, pull up the associated hash, and then search for the hash to see who else used that password, and list all of their password hints.
But until someone does, you could just Google "most common passwords" and if yours is in the set, you win!