I don’t normally mark St. Patrick’s Day in any linguistic fashion, but this year I have a short article at Mental Floss about how to pronounce Celtic – is it /ˈsɛltɪk/ ‘Seltic’ or /ˈkɛltɪk/ ‘Keltic’?
In my own usage it’s both, depending on the context, but there seems to be a lot of uncertainty and debate over which is the ‘correct’ pronunciation. So I hope my article goes some way towards resolving the matter. Here’s a excerpt:
Celtic pronounced “Keltic” is an outlier in English phonology. Nearly every other English word beginning ce- has a soft-c sound: cedar, ceiling, cell, cement, cent, cereal, certain, cesspit, and so on (cello, with its “ch-” onset, is another anomaly). So it shouldn’t surprise us that “Seltic” was once overwhelmingly the norm. The now-dominant pronunciation “Keltic” is a modern innovation.
You can read the rest at Mental Floss, and feel free to leave a comment either there or below.