It seems not. Tintagel apparently means “fort by the neck of the land” ([1]), while the etymology of tin seems to be from a proto-Germanic word for the metal.

It seems not. Tintagel apparently means “fort by the neck of the land” ([1]), while the etymology of tin seems to be from a proto-Germanic word for the metal. [1] https://oldsomerset2.wordpress.com/2016/01/23/whats-in-a-name-tintagel/ https://oldsomerset2.wordpress.com/2016/01/23/whats-in-a-nam... [2] https://en.m.wiktionary.org/wiki/tin https://en.m.wiktionary.org/wiki/tin