Sianne is of Welsh origin and means "God is gracious". It is a variant spelling of the name Siân, which is quite popular in Wales but less commonly used elsewhere. The name Sianne has a unique and elegant sound, offering a distinctive option for parents seeking an uncommon yet beautiful name for their daughter.
"The name Sianne saw a peak in popularity between 1997 and 2003 with a combined total of 74 births during this period, while the years 2001 to 2008 showed a decline in usage with only 16 births recorded."