§ Poros ’Boundary’, Ereg ’First’, Sirith (TI:312)
On Sirith see VT42:11.
Ereg appears later as Erui (VT42:10), the formation of the earlier form seems to be done with the adjectival suffix *-kā > -g; compare SPAY- > Q. faika ’contemptible, mean’, N. foeg ’mean, poor, bad’ and deleted tadeg ’second’ (VT42:10) < TATA-, ATTA- (VT42:24).
Poros is difficult to interpret; it would require primitive *por-, *kwor- or *pār-, *kwār- but POR- with Q. pore ’flour, meal’, KWAR- ’clutching hand’ (ON pōre ’fist’), PAR- ’compose, put together’ do not seem suitable; so it is probably one of the not translatable names and ’boundary’ may refer to the river’s role, not its meaning.