"Brittonic *melino- 'yellow' (OW melin, melen, MW. melyn, OBret. milin gl. flauus, OCo. milin gl. fuluus) probably represents a derivative from PCelt. *meli- 'honey'. The development of 'honey-coloured' to 'yellow' would be unremarkable" (RM).
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
Robert Farren, PIE culture words collection, 2017
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