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Toponymists have had difficulty explaining the origin of ' Tintagel ': the probability is that it is Norman French, as the Cornish of the 13th century would have lacked the soft ' g ' (' i/j ' in the earliest forms: see also Tintagel Castle).
Scholars have found it hard to explain the origin of ' Tintagel ' as a name: the most likely one to be correct is from Norman French, rather than from Cornish.