Where does “lǫm” come from?

lǫm (Old Norse) comes from Esperanto lamo, from Spanish llama, from Latin flamma, from Latin flāgrāre, from Latin frāgrō, from Proto-Italic frāgrāō, from Proto-Indo-European bʰreh₂gro-, from Proto-Indo-European bʰreh₂g- — to smell.

Ancestry of “lǫm”, step by step

Step	Language	Word	Meaning
1	Esperanto	lamo	llama
2	Spanish	llama	flame; llama
3	Latin	flamma	flame, fire
4	Latin	flāgrāre	—
5	Latin	frāgrō	to emit a smell of, to smell of, to be redolent of, to reek of
6	Proto-Italic	frāgrāō	—
7	Proto-Indo-European	bʰreh₂gro-	—
8	Proto-Indo-European	bʰreh₂g-	to smell

Every word from Proto-Indo-European bʰreh₂g- →Every word from Proto-Indo-European bʰreh₂gro- →Every word from Proto-Italic frāgrāō →