What is the correct, or at least most accepted/used pronunciation of "Celtic"? [duplicate]

I checked Cambridge dictionary, but it gives both pronunciations (with a 'k' and with a 'S' - sorry, I don't know phonetic symbols) as correct.

However, for most words with more than one "correct" pronunciation, there is always one more used/accepted.

What is the case with "celtic"?

Solution 1:

The word 'Celtic' used for languages and cultures is usually pronounced with a hard 'C', 'keltic'. The only time we use a soft 'C', 'seltic', are when saying the names of the Glasgow Celtic FC football ('soccer') and Boston Celtics baseball teams, and possibly some others.

Aside from this use of the initial soft 'c' in sports teams' names, Celtic with a hard 'c' is the standard; however, you might still sometimes hear the 'c' softly sounded by those who are uninitiated in the history and etymology of Celt and Celtic as well as those who are unfamiliar with the words and resort to the phonetic rules of English. (And, as happens so often in English, those phonetic rules let them down.)

Many sources say that the 'seltic' pronunciation was correct and accepted for both up to approximately the middle of the 20th century.

Pronunciation of Celtic (Merriam-Webster)