Where does “ika'y” come from?

ika'y (Tagalog) comes from Tagalog ikaw, from Proto-Malayo-Polynesian i-kahu, from Proto-Austronesian i-kaSu.

Ancestry of “ika'y”, step by step

ika'y traces back through two separate lines of ancestry.

via Tagalog ikaw

StepLanguageWordMeaning
1Tagalogikawyou
2Proto-Malayo-Polynesiani-kahu—
3Proto-Austronesiani-kaSu—

via Tagalog 'y

StepLanguageWordMeaning
1Tagalog'y—
Every word from Proto-Austronesian i-kaSu →Every word from Proto-Malayo-Polynesian i-kahu →Every word from Tagalog ikaw →