Brennick is an uncommon yet distinctive given name of Irish origin. It's derived from the Gaelic 'Breanadh,' which means 'speckled' or 'piebald.' Historically, Brennick was used as a surname first and foremost, but it has since evolved into a unisex given name in recent times. Spelling variations include Branock, Brenach, and Brennach.
"Brennick saw 6 births in 2009, followed by a gap of two years before another 5 babies were born in 2011. After another five-year pause, the name resurfaced with 6 more births in 2016, bringing the total to 17."