Duk da haka, wasu bincike ya postulated cewa al'adun ci gaba sannu a hankali da kuma ci gaba, da kuma cewa gabatarwar Celtic harshe da kuma abubuwa na Celtic al'adu na iya kasance a sakamakon al'adu musayar da Celtic kungiyoyin a kudu maso yammacin Turai daga Neolithic ga Bronze Age.The hasashe cewa 'yan qasar Late Bronze Age mazauna sannu a hankali tunawa Celtic tasirin tun da aka goyan bayan wasu 'yan kwanan nan kwayoyin bincike. Romawa zuwa Ireland ake magana a kai a matsayin Scotia 500 AZ da kuma daga baya Hibernia. Ptolemy, a 100 AZ, rubuce a cikin labarin kasa na Ireland da kuma Ireland. Ireland bai taba zama wani ɓangare na Celtic harsuna, amma ya rinjayi da Celts daga nahiyar.
Ptolemy