Where does “nꜥr-mr” come from?

nꜥr-mr (Egyptian) comes from Egyptian mr, from Proto-Afroasiatic m-r — heap of stones; river, channel.

Ancestry of “nꜥr-mr”, step by step

Step	Language	Word	Meaning
1	Egyptian	mr	pyramid; heap of corpses; canal, ditch, waterway
2	Proto-Afroasiatic	m-r	heap of stones; river, channel

nꜥr-mr — Etymology, Origin & Word History | Etymology Explorer