Latin.
The generally accepted way to pronounce is Kelt. Taken from the Greek word Keltoi. The Latin equivalent is Celt (or Selt) taken from the Latin word Celtae.
you say helmet in latin (casco)<- in latin
To say "Who am I?" in Latin you can say "quisnam sum Ego?"
How do you say determined in Latin?
infitialis is the word we say in latin
No, they are descendants of Latin-speaking Celts, of course, the Visigoths were incorporated into the population, but still, Spaniards are not germanic.
To say the word lightning in Latin, a person would say the word "ignis." To say thunder in Latin, the word is "tonitrua."
There are no articles in Latin. (a, the, an)
my is "mihi" in latin
The celts did not have pencils.
"Sī placet" is how you say "please" in Latin.