This is a picture of one of Curt Johnson's sister's, Lella Johnston.
She was born August 17, 1894 and died April 13, 1977. She married Manford France,
born September 18, 1885 and died January 2, 1964.

As you can see with the spelling of Johnston and Johnson, my Grandfather took the T out of it.
I don't know if the others did or not. My Great Grandfather used the T.

Photo is courtesy of Rachel Osborne and Pat Harmon