Where does “Siân” come from?

Siân (Welsh) comes from Latin Joanna, from Ancient Greek Ἰωάννα, from Hebrew יוֹחָנָה, from Hebrew יוֹחָנָן, from Hebrew יְהוֹחָנָן — God is gracious.

Ancestry of “Siân”, step by step

Step	Language	Word	Meaning
1	Latin	Joanna	—
2	Ancient Greek	Ἰωάννα	—
3	Hebrew	יוֹחָנָה	—
4	Hebrew	יוֹחָנָן	God is gracious
5	Hebrew	יְהוֹחָנָן	God is gracious

Every word from Hebrew יְהוֹחָנָן →

Siân — Etymology, Origin & Word History | Etymology Explorer