อาจ

Built from

Borrowed from Old Khmer ʼāca, ʼāc, ʼâca, ʼācca, ʼac, ʼac, hāc (“to be able, capable, or competent; to allow, to permit; etc”). See อำนาจ (am-nâat, “power, authority”), borrowed from an extended form of the Khmer, for more.

From Wiktionary