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There is no such language as Celtic. Celtic refers to a group of more than a dozen different languages, six of which are still spoken today: Irish Gaelic Scottish Gaelic Welsh… Breton Cornish Manx
Perhaps this information on "Answers.com" may assist you in learning and forming your own deduction: http://www.answers.com/topic/pronunciation-of-celtic
Irish: abhainn Scottish: abhainn Welsh: afon Breton:
In Irish it's dragún / dragan In Welsh it's "draig" In Scots gaelic it's dràgon / nathair sgiathach
In Irish "ridire" In Welsh "marchog"
Irish: toirneach Scots Gaelic: tàirneach; tàirneach; torrann Welsh: taran(au), tyrfau, trystau
Irish: aingeal Scots Gaelic: aingeal Welsh: angel
In Welsh: a enillwyd In Irish: tuillte In Scottish Gaelic: coisinnte
Irish: draíocht Scots Gaelic: draoidheachd Welsh: hud; dewiniaeth; swyngyfaredd
In Irish it's mathúin / béar In Welsh it's "arth" In Scots Gaelic it's "mathan"
In Irish it's "síocháin". In Scottish Gaelic it is sìth In Welsh it is heddwch (also tangnefedd)
Irish: ansiúd/thall (adverb); thar; lastall de; taobh thall de (preposition) Scots Gaelic: thall; thairis; seach; thar Welsh: tu hwnt
There's actually no such language as "Celtic". Celtic refers to a group of dozens of languages, six of which are spoken today: BretonCornishIrish GaelicManxScottish GaelicWel…sh
Irish: ceannairc; éirí amach; reibiliún Scots Gaelic: ceannairc; aramach; reubalachd Welsh: gwrthryfel
Scottish Gaelic: taigh-fuine or taigh-fuinn Irish Gaelic: bácús Welsh: popty
Irish Gaelic: cloch Scottish Gaelic: clach Welsh: carreg or maen