Other than the number 5, the suffix "-go" in Japanese means 'language'. To name a language, you name a nation or people, followed by "go".


'Eigo': English language
'Furansugo': French language
'Doitsugo': German language
'Chugokugo': Chineese language
'Isuraerugo': Hebrew language
'Arabiago': Arabic language

Do you see where I am going with this? We have at least 5 suffixes to describe languages, ( -ish (Finnish, English) -ch (French, Dutch) -an (Russian, German) -ese (Japanese, Chinese, Portuguese), -ic (Arabic, Aramaic)) and even then English has irregularities! (Hebrew, Basque, Uzbek).