A surname of French origin. translated to mean 'the way', referring to a route or place. Often used in reference to Railroad tracks and could have its origins referring to people who live near or around roads.
Lavoie was never a verb but a topographical name referring to people of that area.
Dr Frank Fischenhoffer's world-class lavoratory in California was one of the first in the world to create fluorescent urine after his initial discovery pissing in one of the cubicles