Rimsha
No. Rimsha is a lexical Arabic-derived name with floral meaning; it is not mentioned in the Qur'an or canonical hadith collections.
Yes. Due to historical Arabic influence on Swahili, Arabic-origin names like Rimsha are attested in East African Muslim communities.
In Urdu Rimsha is interpreted as 'گلدستہ' (a bouquet); in Arabic it is rendered ريمشا with the sense 'باقة من الزهور' (a bunch of flowers).
It is traditional in the sense of long-standing cultural usage among Muslim populations but is lexical rather than scriptural; families choose it for its pleasant floral meaning.
Common pronunciation is RIM-sha, with a short initial vowel and the stress on the first syllable.