Where does “queijão” come from?

queijão (Portuguese) comes from Portuguese queijo, from Old Portuguese queijo, from Latin cāseus, from Proto-Indo-European kwat- — to ferment, become sour; to boil.

Ancestry of “queijão”, step by step

Step	Language	Word	Meaning
1	Portuguese	queijo	cheese
2	Old Portuguese	queijo	cheese
3	Latin	cāseus	cheese
4	Proto-Indo-European	kwat-	to ferment, become sour; to boil

Every word from Proto-Indo-European kwat- →Every word from Latin cāseus →Every word from Old Portuguese queijo →