Sîrîn
No. Sîrîn is of Persian origin and famous from Persian literature; it is not derived from the Quran but is commonly used by Muslim families in Persianate and Kurdish communities.
The name Shīrīn appears in classical Persian literature (for example the romance of Khosrow and Shirin); Sîrîn is the regional Kurdish/Persianate form with the same meaning.
Yes. It carries a positive meaning ('sweet' or 'pleasant') and is widely used among Muslim families in Kurdistan and neighboring regions.
Pronounced see-REEN, with stress on the second syllable; regional accents may vary slightly.
The literary figure Shīrīn, heroine of Persian poetic tradition, is the most well-known historical/literary bearer; Sîrîn is the Kurdish/Persianate variant used in regional contexts.