QUICK ANSWER
"Tu" is a form of "tu", an adjective which is often translated as "your". "Pablo" is a proper noun which is often translated as "Paul". Learn more about the difference between "tu" and "Pablo" below.
tu(
too
)An adjective is a word that describes a noun (e.g., the big dog).
1. (informal) (possessive)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).