Guerin is a French name derived from the Germanic word 'Wari', which means 'guard'. It was originally a surname, but has since become popular as a given name. In France, Guerin was particularly prevalent in the Middle Ages, with notable figures such as Guerin of Nogent, a French poet and musician who lived in the 12th century.
"The name Guerin experienced several spikes in popularity between 1967 and 2011, with peaks in the late 20th century and early 21st century, totaling 62 births."