Where does “Omkaar” come from?

Omkaar (English) comes from Sanskrit ओंकार — om, aum; the sacred syllable/exclamation Om.

Ancestry of “Omkaar”, step by step

Step	Language	Word	Meaning
1	Sanskrit	ओंकार	om, aum; the sacred syllable/exclamation Om

Omkaar — Etymology, Origin & Word History | Etymology Explorer