Why was 15 March, the date of Caesar’s murder, called the ‘Ides of March’?

Why was 15 March, the date of Caesar’s murder, called the
‘Ides of March’?

“Beware the Ides of March!”
We’ve all heard the warning that Julius Caesar didn’t heed, but why was it called the ‘Ides of March’ at all? The later Roman calendar had 12 months, with the third, March, named for Mars, the god of war.

To help people keep track of the date, each month was punctuated by three named days: the Kalends, Nones and Ides. The Ides were sacred to Jupiter, king of the gods, and fell just before the middle of each month. In March, they fell on the 15th.

The Romans themselves, however, argued over the root of the word Idus (Ides’). Some thought the Ides originally coincided with the full moon and that the word reflected ideas of light, sight or fullness, coming either from the Etruscan itis (Jupiter’s light), the Latin vidus (vision'”), or the Greek eidos (‘form’). Others argued that it came from an old Etruscan verb iudare (to divide’), because the Ides were the main dividing point of the month.

Source ~ BBC history