Words and Proper Names

ferba fíra

1093.
Lindeman (Fredrik Otto): Varia: I. 1. Archaic Irish ferba fíra: a speculative note.
In Ériu 41 (1990), pp. 123–125.
vs. C. Watkins, in G. Cardona and N. H. Zide (eds.), Festschrift for Henry Hoenigswald (Tübingen 1987), 403; takes fíra to be acc. pl. fem. of adjective *wı̄ro/ā- < PIE *swēro/ā- ‘heavy’.