From Tolkien Gateway
Main article: Rohirrim

Eorlingas was a name sometimes the Rohirrim used for themselves, as followers and descendants of their first King, Eorl.

The word was used in a call to arms chanted by King Théoden when Gandalf had healed him:[1]

Arise now, arise, Riders of Théoden!
Dire deeds awake, dark it is eastward.
Let horse be bridled, horn be sounded!
Forth Eorlingas!


eorl + -ingas

In a manuscript, the form Eorlings also occurs.[2]

The word is an Old English translation of the Rohanese þorunahim (sg. þuron).[3]