I think I might have a lead. I searched the surname Joffrion in TX around my grandfather's birth, and there was a man with similar initials; Herman D. Joffrion, Sr. (instead of H.P. Jophryn). Honestly I could see how the P would get mistaken for D.
Anyhow, Herman and his family lived in Dallas in the 1920s then moved down into Port Arthur right before 1940. Makes sense to me; I only wish I could confirm this information...