Dáin II Ironfoot

Tolkien doesn't give more than brief notes on the pronunciation of Dwarf names, and certainly nothing that would help with 'Dáin'. If the name were Elvish, it would be pronounced 'dine', but as it follows the form of Old Norse, this is not likely to apply. The use of a long á suggests that something like 'dawin' might be a possibility, but given the lack of direct evidence, the more natural 'dayn' is as good an alternative as any.