Abraham's Name-Change

I knew God changed Abram's name to Abraham.

I knew God instituted the sacrament of circumcision for His people.  (In the new testament, baptism corresponds to this -- the way sinners are brought into God's people and marked as His own.)

But it never crossed my mind until this week that those two things happened at the same time.  Little boys got their names at the time of their circumcision (Luke 2:21).  Today, in the baptism rite, children are named.  But looking at Genesis 17, even Abraham received his name at his circumcision ... old age notwithstanding. 

I think that's kind of cool.