The Louie surname project attempts to trace the mutual connections of those men of who carry an Asian, European or Native American Y haplogroup and descend from someone with the surname Louie, all variations, to find commonality between the participants. Only males carry Y-DNA and the project focuses on following male lines.  As a courtesy, the project allows male and female Louie descendants to test their mtDNA but mtDNA does not follow a single surname so the genealogy aspect of the project will focus primarily on Y-DNA.  Those wishing to look for Louie cousins may choose to test their autosomal DNA with Family Finder and if they are a male with a different surname they will be listed as Guests in the Y-DNA results.

Asian variants of this character 雷  are:

Lei (Mandarin)
Lui, Leoi, Loi (Cantonese)
Louie, Louis (Taishanese)
Lui (Hokkien, Teochew)

Lūi (Gan)
No, Ro (Korean)
Lôi (Vietnamese)