Definitions
McArthur 1993: likely anthroponym (qualified, see reference)
Killen 1979: anthroponym of an official
Chadwick & Ventris 1973: "unequivocally" an anthroponym at PY Cn and PY Jn, doubtful at Knossos and PY Un. "strong reasons for regarding it as the name of an unguent-maker are adduced by Godart (1968)"
(Knossos) Chadwick 1964, Palmer 1965: ethnic adjective, cf. ethnic adjective Κύπριος from toponym Κύπρος 'Cyprus'
(Knossos, PY Un) Palmer 1963: the name of an aromatic spice
(Knossos) Szemerényi 1958: ethnic adjective, cf. *Γύβλιος from toponym 'Byblos'
*reconstructed spelling not attested in Greek
References
Chadwick, John and Michael Ventris, 1973 Documents in Mycenaean Greek
Chadwick, John, 1964 Mycenaean Studies "Pylos Tablet Un 1322"
Godart, Louis, 1968 Studi Micenei ed Egeo-Anatolici (SMEA) 5 «ku-pi-ri-jo dans les textes myéniens»
Killen, John T., 1979 Colloquium Mycenaeum "The Knossos Ld(1) tablets"
McArthur, Jennifer K., 1993 Suplementos a MINOS núm. 9 "Place-Names in the Knossos Tablets Identification and Location"
Palmer, Leonard R., 1965 Language 41:2 "Review of Mycenaean Studies"
Palmer, Leonard R., 1963 Interpretation of Mycenaean Greek Texts
Szemerényi, Oswald J.L., 1958 (CR) 8 "Review of Documents I"