The origin of the name Malachi is Hebrew
This is how Malachi is written in Hebrew:
מַלְאָכִי = Mal`akiy
The biblical meaning of the name Malachi is My messenger
Malachi was the prophet who wrote the last book of the Old Testament
The name Malachi appears in the bible in the following verse:
Malachi 1:1 KJV
The burden of the word of the LORD to Israel by Malachi.