Family name origins & meanings
- French : topographic name for someone who lived by a pear tree, poirier, from Old French perier.
- A Poirier from Paris is recorded in Quebec City in 1655 with the secondary surname Bellepoire. Other associated secondary surnames include <xref>Lajeunesse</xref>, <xref>Langevin</xref>, <xref>Lafleur</xref>.