Siobahn Is A Baby Girl Name Of Irish Origin. If You’re Raising Baby Religiously, You Can Feel Proud To Have Found A Name With The Meaning, “God Is Gracious.” Usually Spelled A Little Differently And With A Fada, The Name Siobhán Traveled From The Irish Shores And Its Variation Made Homes In Countries Like South Africa, England, And The United States. Though This Name Is Also Associated With The Anglicized Name Joan, The Name Siobahn Will Allow Baby To Tap Into Both Her Irish And Her Spiritual Roots.