there was a Valmount Gallow(Gallot) who married a sister of my gg grandmother, Leonora Young SAM. Amelie Young married Valmount Gallot in the years after the Civil War. The 1880 census of St. Landry Parish lists them..

Valmon GALLOT, age 48, mulatto, farmer LA LA LA
Amelia GALLOT, wife,age 37, mulatto,(gg grandmothers sister)
L.Oval GALLOT, son, age 10, mulatto
Onezime GALLOT,son, age 4, mulatto

living a few doors down was her widowed mother(my ggg grandmother)

Caroline YOUNG,age 50, widow, mulatto, keeping house
Edmond Young, age 15, son, mulatto, laborer
Leonore Young,age 13, mulatto, daughter, laborer

Leonore/Leonora/Leotine Young is my gg grandmother. She married Aristide SAM sr. in 1903 in a Washington Church. Both of her parents were slaves freed after the Civil War. I found her father, Emmanuel Young, listed in the morality census of 1880 in that region of Louisiana. I find it curious that both of these families were listed as mulatto. This leads me to suspect that Manuel Young might of had mixed ancestry himself. The parents of Caroline Young was the white cajun, Lastie Scholastie FRUGE, and a slave named Rose Littel.

There were some free people of color named GALLOW/GALLOT who did live in the area. Gallot and Guillory are two distinctly different names. I dont know if a census enumerator would make that kind of mistake..but then again.. i had a hell of a time finding my ggg grandfather, Jean Pierre SAM in the 1870 census of Lafayette Parish until someone told me that he was listed as Jean Pierre SAN.
Just my two cents.