Least Tern

Sternula antillarum

'Least' means 'smallest,' and its scientific name agrees: Sternula means 'little tern.' The second half, antillarum, means 'of the Antilles,' the islands of the Caribbean.

Sternula is a 'little' form of Sterna, from the Old English stearn, 'tern.' 'Tern' came into English from a Scandinavian language.