There's been all kinds of speculation in recent years about the name of Badillo Street in Covina and why it differs from the pioneer family's traditional Spanish name, Badilla.

Covina's main east/west street was named "Badillo" on the original Phillips Tract survey map in 1884.
Courtesy Covina Valley Historical Society.
I briefly mentioned my own ideas about this controversy at the end of the article about Hollenbeck and the Badillas that I posted back in 2021. I noted that the family appeared to use a terminal -o in their surname themselves on occasion, and theorized that the street was named "Badillo" because that was the name the farming brothers were best known by.
I didn't have direct evidence for the former claim until just yesterday, though, when I found this letter published in a newspaper in 18771 that was signed, "J. Julian Badillo." This was the first time I'd ever seen printed evidence that one of the famous coffee-growing brothers actually used the Badillo spelling himself (and the first I've seen the name of their coffee plantation was "San Isidro Ranch.")

Santa Barbara Daily Press, February 7, 1877.
So then I thought, since I'm already on the newspaper archive website, I decided to take pen in hand and manually tally the number of times each spelling was used, and in which contexts they appeared.
This is what I found: