A noun for “brand” in The Etymologies of the 1930s derived from the root ᴹ√YUL “smoulder” (Ety/YUL). The form iolv was written next to it, probably indicating pronunciation (EtyAC/YUL). It was marked ON. but should probably be N. as suggested by Hostetter and Wynne (EtyAC/YUL).
Neo-Quenya: This word would become ✱ylf if adapted directly to Neo-Sindarin, but that conflicts with S. ylf “drinking-vessel” (WJ/416). For purposes of Neo-Eldarin, I would adapt the root ᴹ√YUL “smoulder” as the Neo-Root ᴺ√YOL, which would allow the retention of this Noldorin word unchanged since it could be derived from ✱yolmā instead.
The word is classed as Old Noldorin (ON) in the Etymologies, but rather seems to be Noldorin