Parents like odd-sounding/-spelt names for their children. Often the children, when old enough, are not quite so on-board with having to spell their name multiple times in any situation in which it helps to transmit it to others. When none of your friends can spell your name, and everyone in your locality pronounces it wrong when reading it, then Diarmaid, your parents - IMO - chose poorly.

Of course that raises the question of translation, transliteration, and language specific names (first-language Chinese speakers in the UK seem always to have a Western name - my friend says she got hers from her English teacher).