We have also a direct attestation on this matter in the GL:
_glin_ 'sound, voice, utterance, cp. suffix _-glin_, _-grin_, _-drin_,
in names of languages' (PE11:39). The second suffix is clearly part of
_Goldo-grin_ *'Noldo-language' itself.
The word _glin_ and also _gling_ 'music', _glingrin_ 'musical', _lin-_
'sound (intr.)', _lintha-_ 'sound (tr.), strike or ring bell, etc;
play an instrument' (PE11:39,54) can be related to LIRI 'sing' or LINI
(PE12:54); later LIN-, GLIN- 'sing', LIR- 'sing, trill' (V:359,369) in
But the suffixes _-grin_ and _-drin_ seem to be formed from a parallel
root *RIN(I) (or modified LIN(I)?), for which I have found no further
mention. Compare Q. _rinko_ 'disc, circle, orb' (PE12:80), where
Goldogrin has _drinn_ '+ ring, disc' (PE11:30) or Q. _riqi-_ 'wrench,
twist' and G. _grinn_ 'ankle, wrist' (PE11:42).
Therefore I think it is likely that the suffixes _-rin_ and _-lin_ (in
_Inwelin_) of the Qenya language names are just the cognates of G.
_-grin_, _-drin_, _-glin_ without the modification with _g_ or _d_; at
least at the time of the Lexicons.