Oliver -
Peaceful Heart 
Philippians 4:7 
New King James Version (NKJV)

7 and the peace of God, which surpasses all understanding, will guard your hearts and minds through Christ Jesus.

Harrison - Strong Leader 

Joshua 1:9 

New King James Version (NKJV)

9 Have I not commanded you? Be strong and of good courage; do not be afraid, nor be dismayed, for the Lord your God is with you wherever you go.”