Where does “Maglasang” come from?

Maglasang (Cebuano) comes from Cebuano mag-, from Austronesian *maʀ-.

Ancestry of “Maglasang”, step by step

Step	Language	Word	Meaning
1	Cebuano	mag-	actor trigger verb prefix, infinitive form
2	Austronesian	*maʀ-	—