Where does “Tanaka” come from?

Tanaka (Tagalog) comes from Japanese 田中, from Japanese 田, from Japanese 熊田 — Kumada (neighborhoods in Japan).

Ancestry of “Tanaka”, step by step

Step	Language	Word	Meaning
1	Japanese	田中	the 4th most common surname in Japan
2	Japanese	田	rice paddy; cultivated field
3	Japanese	熊田	Kumada (neighborhoods in Japan)