'Scorpii' originates from Latin, specifically the word 'Scorpius', where 'Scorpius' meant 'scorpion'.

'Scorpius' came from Ancient Greek 'Skorpiós' (σκορπίος) meaning 'scorpion', was adopted into Latin as 'Scorpius', and the Latin genitive form became 'Scorpii', now used in modern astronomical Latin for star names.

Initially it referred to the animal 'scorpion' (and the constellation named after it); over time the genitive form 'Scorpii' came to be used in modern astronomy specifically to indicate belonging to the constellation Scorpius in star designations.