Where does “ベルギー王国” come from?

ベルギー王国 (Japanese) comes from Japanese ベルギー, from Dutch België, from Dutch -ië, from Middle Dutch -ie, from Old French -ie, from Latin -ia, from Latin -ius, from Proto-Italic -jōs — Creates adjectives from noun or verb stems.

Ancestry of “ベルギー王国”, step by step

ベルギー王国 traces back through two separate lines of ancestry.

via Japanese ベルギー

StepLanguageWordMeaning
1JapaneseベルギーBelgium
2DutchBelgië
3Dutch-iëUsed to form country names
4Middle Dutch-ie
5Old French-ieindicates a feminine noun, often an abstract one
6Latin-iaUsed to form a feminine abstract noun, usually...
7Latin-iusforming adjectives from nouns; nominative neuter...
8Proto-Italic-jōsForms comparative adjectives
9Proto-Indo-European-yósCreates adjectives from noun or verb stems

via Japanese 王国

StepLanguageWordMeaning
1Japanese王国kingdom
2Middle Chinese王國
Every word from Proto-Indo-European -yósEvery word from Latin -iaEvery word from Latin -ius