Generally said to be from Lat. gladius m. ‘sword’ <- PCelt. *gladio-, *kladio- 'sword'; an alternative hypothesis is that OFr. glaive is a loan from a Brittonic *klafido (from PCelt. *kladyo, compare Lat. gladius), introduced in Gaul with the Brittonic invasion, ca. 460 onwards, become *glafido under influence of Lat. gladius (TLF).
Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
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
Trésors de la langue francaise informatisées. Centre national de ressources techniques et lexiques. http://www.cnrtl.fr/definition/
Robert Farren, PIE culture words collection, 2017
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