God is gracious
Siann is a modern phonetic variant of the Welsh name Sian, which is the Welsh form of Jane. It ultimately derives from the Hebrew name Yochanan, meaning 'God is gracious'. While the traditional Welsh spelling is Siân, this version is often used in English-speaking contexts to clarify pronunciation.
Fewer than 5 girls were named Siann in 2025.
US births per 5-year period, 1990–present (SSA data).
Lead singer of the band Kosheen
Acclaimed Welsh stage and film actress
British actress known for Sherlock
BAFTA-winning actress from Fleabag
