Meaning A version of the name Joan, which means 'God has been gracious' or 'God's grace'. Origin of Siobhan Celtic , Irish Popular Middle Names MaKenna, Malee, Nathalia, Nicole Pronunciation 🔊 Listen Siobhan shiv-on Similar Names Jeanetta Hannah Lillyanna Lilyana Lily Isla Charlotte Grace Joani Joannie Year by Year Popularity of Siobhan