Baltra is a Spanish surname particularly common in Chile, but no records are known that explain which person was the namesake for the island. It is first attested in the form  in the British Admiralty's 1927 South America Pilot, having been added at some point after the first 1915 edition.
The Baltra surname, primarily found in Chile, lacks historical documentation explaining its origins or the person it was named after. It first appeared in the British Admiralty's 1927 South America Pilot, appearing later than the initial 1915 edition.