Masuma
Masuma (معصومة) literally means 'protected from sin' or 'innocent', from the Arabic adjective maʿsūm (معصوم).
Yes. A well-known historical bearer is Fatimah al‑Masūmah (Fatima bint Musa), daughter of Imam Musa al‑Kadhim; her tomb in Qom is a documented pilgrimage site.
Yes. Fatimah al‑Masūmah is the principal historical figure bearing this epithet/name and has devotional significance particularly in Shia Islam.
Pronounced mas-OO-mah; in more precise Arabic transliteration: Maʿsūmah (maʿ.suː.ma), reflecting the ʿayn (ع) after the initial m.
Usage is concentrated in Persianate and Shia communities (Iran, parts of South Asia, etc.) rather than uniformly across all Muslim communities; it is relatively uncommon elsewhere.