Oarsman or from Reims
Rhemi is a modern spelling variant of Remy. It likely derives from the Latin name Remigius, meaning 'oarsman', or refers to the Gallic tribe of the Remi who founded the city of Reims in France.
Less common today
Rhemi isn't in the latest US Top 1000. It last peaked at #5,278 in 2016.
US births per 5-year period, 1990βpresent (SSA data).