Malachy Is A Boys Name With Hebrew And Irish Origins. This Beautiful Form Of Malachi Means "messenger Of God" And Refers To A Prophet In The Bible And The Author Of The Book Of Malachi. Youll Undoubtedly Be Tempted To Shorten It To Mal Or Kai When Theyre On Their Best Behaviour. If Youre Looking To Honor Babys Irish Heritage, You May Already Know That Actor Cillian Murphy Of Peaky Binders chose This Name For His Son. Despite Its Irish Meaning Of "servant" And "second," Youre Stubborn Little Angel Will Only Settle For First Place!