Where does “ออกแบบ” come from?

ออกแบบ (Thai) comes from Thai ออก, from Proto-Tai ʔoːkᴰ — to exit.

ออกแบบ (Thai): to design

Definitions

Step	Language	Word	Meaning
1	Thai	ออก	to pay; to come under; to come or go out, into...
2	Proto-Tai	ʔoːkᴰ	to exit

ออกแบบ — Etymology, Origin & Word History | Etymology Explorer