Last name origin & meaning:
French: topographic name for someone who lived on marshy land, from
a diminutive of Old French jaille ‘marsh’, ‘mud’, now a
regional term found mainly in western France. It may also perhaps have
been a nickname with the sense ‘muddy’; in the Jura the word is
applied to a cow with dark patches on its flanks. In the U.S., Jaillet
is concentrated in MA.
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