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).