There's been all kinds of speculation in recent years about the name of Badillo Street in Covina and why it differs from the family's traditional Spanish name, Badilla.
I briefly mentioned my own ideas about this controversy at the end of the article about Edward Hollenbeck and the Badilla brothers that I posted back in 2021. Just yesterday, though, I found this letter published in a newspaper in 18771 that was signed, "J. Julian Badillo," which is the first time I've ever seen proof in print 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: