Clodagh

The only Clodagh I've known is South African: she pronounced it CLOWdah, where Clow rhymes with Glow or Sew.

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Her family had no Irish connections, except that they were planning a holiday visit and had written a few random places they intended to visit. Then they wrote the names they had chosen for their daughter on the reverse side, handed the paper to the priest, and he read out Clodagh instead of their actual choice, which I never knew. And they accepted it.

Pronounced Clo-da. The gh is silent.