Personal = (adjective)  belonging to or affecting a particular person.

• I don’t want to interfere in her personal matters.
• He takes personal interest in her progress.
• Pilgrims are warned to keep their personal belongings with them.

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Personnel = (noun , ( sing or plural verb) staff, persons employed in any work, especially public undertakings and Armed Forces.

• There were 10 airline personnel on the plane when it crashed down.
• Personnel Manager is one who is in charge of relationship between individual employees, their problems, grievances etc.
• Please contact the personnel manager for more information.
• This area is earmarked for military personnel.