Yes, I use Wikipedia and it is useful if the word is found in it. And thank you for your advices for the Britons and the Gauls, I'll try them. Then I have got my problems clearer: 1. In which language is this word written? 2. Is this word transliterated or latinized or hellenized? 3. Are there any phonetic guide for the appropriate language? Q1 and Q2 are not so difficult generally, but Q3 gives me the headache in case of minor ancient languages, those except Latin, Greek and Sanskrit.