personal, personnel

Personal or personal ( pronounced PER son ull ) means intimate or closely connected--
They had a close personal relationship for many years.
She didn't like the idea of anyone reading her personal correspondence.
Personal may mean pertaining to one's private life or affairs--
It's rude to make personal remarks about strangers.
There's no need to get personal.
Don't give personal information to strangers.
Personal may simply mean social as opposed to business--
Is this a personal call?
Don't make personal calls on company time.

Personnel or personnel ( pronounced per son ELL ) refers to the business department in charge of employee files and information--
If you need to know about your benefits, call the personnel office.
I got a note from the personnel department about a new insurance plan.
All personnel decisions are made in the main office.

Now that you know that, you can say--
"There may be personal information in the personnel files."

Note--not to be confused with "persona" a Latin word used in English to mean someone's personality and character--particularly as he or she appears to others, or the details of his or her life that are accessible to anyone--as a character in a novel might be--
She wanted to project the persona of a sophisticated  older woman.