Deior is an ancient Celtic male given name, derived from the Proto-Celtic word "deiu" meaning "god". It was popular among the Britons during the medieval period but has since become quite rare. The name Deior is associated with the Romano-British deity known as Deiros or Deio. This deity was likely a local god of the area where the name was prevalent, and his name may have been adopted by some families as a means of showing reverence to their local deity. Today, Deior is considered a unique and distinctive name choice for those interested in Celtic history or mythology.
"The name Deior saw an increase in popularity with 7 births in 2021, up from 5 births in 2020, totaling 12 births over the two years."