God gives Abram and Sarai new names in Genesis 17, calling them Abraham and Sarah. We often focus on the meaning of the names:
Abram means "exalted father."
Abraham means "father of nations."
Sarai means "my princess."
Sarah means "princess," without the confining "my" possessive.
But perhaps we are meant to look at the appearance of the names as well:
The name of God has two “hey” (ה) letters: YHWH (יהוה)
Abram (אַבְרָם) to Abraham (אַבְרָהָם)
Sarai (שָׂרָי) to Sarah (שָׂרָה)
God gives this portion of His name to the first of His people. Their names/identity come from His, as though He has set His own mark on them.