Meaning of "coates"

Hello, I came across the word coate after a birth name. I'm not
sure if it is part of the name or a description. It is shown as
"Antonio coate mulato". I cannot tell if it is capitalized or not. Has
anyone come across this word in your research? I thought is
might be coyote, but mulato is listed right after.
Cynthia

Could it be that Antonio is a cuate or mellizo (fraternal twin)?

If so, than a possible translation could be: "...Antonio, twin, mulatto..."