Greek rhis (rhin-) cognate of rhygkhos ? < *srungH- ?
Updating...II...
Phorkys (g. phorkynos)
Telkhis (g. telkhinos)
Salamis (g. salaminos)
delphis (g. delphinos) (cf. gWelbHu-)
is (g. inos) "strength"
rhis (g. rhinos)
this (g. thinos)
glo:khis
(akin to glo:ssa "tongue")
aktis (cf. RV aktu)
o:dis 'pang of childbirth'
This -i:n(s) ending also appears in toponyms and theonyms, so we have two alternatives:
1- PIE origin (including "normal" Greek IE, or non-Greek IE adstratum)
2- non-PIE origin substratum
This
ending seems to be a bit anomalous to be "normal" IE Greek, so, it
could be from another IE adstratum or non-IE substratum. Aktis has PIE
etymology, and also probably glo:khis and o:dis. There are also female
-i:n endings in Germanic, if I'm not wrong. But Telkhis and delphis,
for example, are not feminine. And the linking with delphis to delphys
seems a little confuse ("the belly animal", maybe), and we must not
forget toponym Delphoi, that can be related (and a few place-names with
Telph-,Tilph)