S – Your name will no longer be Abram; your name will be Abraham, for I will make you the father of many nations

Genesis 17:5 CSB

O – Commentary:

The patriarch’s name change was crucial. The name Abram (17:5), meaning “exalted father,” harked back to Terah (11:27) and implied that Abram came from royal lineage. But in Hebrew the name Abraham (’aḇrāhâm) sounds similar to “father of a multitude” (’aḇ hămôn) of nations (17:4–5). His new name implied a look ahead to his descendants.

“Genesis,” in The Bible Knowledge Commentary: An Exposition of the Scriptures

A – Abraham’s name change was a reminder of God’s promise.  Same with Isaac changing to Israel and Saul to Paul.  It was a reminder to the person who was receiving the promise.  It also was a point of faith.  Others would hear of the name change to Abraham and probably question “How can I man and wife this old have a baby?”  Abraham and Sarah had to walk their faith out personally and publically.

R – Heavenly Father, you are worthy of all praise and honor.  Give us strength personally in our faith to walk out your promises.  We know that others may question but we are resolute in our believe and trust in you.