Where does “iugoslavo” come from?

iugoslavo (Portuguese) comes from Portuguese -o, from Old Portuguese -o, from Latin -ō, from Proto-Indo-European -ō — Derives nouns from roots.

Ancestry of “iugoslavo”, step by step

StepLanguageWordMeaning
1Portuguese-oforms masculine singular nouns and adjectives;...
2Old Portuguese-o—
3Latin-ōsuffixed to nouns or adjectives. Originally a-stem nouns. Later extended to nouns with other stems. Forms regular first-conjugation verbs
4Proto-Indo-European-ōDerives nouns from roots
Every word from Proto-Indo-European -ō →Every word from Latin -ō →Every word from Portuguese -o →