Mughīth
Yes. Mughīth is derived from the Arabic root غ-ي-ث and is documented in classical Arabic lexica as meaning a succorer or one who gives relief.
No widely recognized Quranic verse uses Mughīth as a proper name; the word's root appears in Arabic usage but it is lexical rather than a Qur'anic personal name.
Yes. The meaning emphasizes mercy and assistance, qualities valued in Muslim communities; the name is rare and scholarly in tone.
It is commonly pronounced mu-GHEETH, represented phonetically as /muˈɣiːθ/ (gh like the voiced velar fricative).
Yes. Related names that share meaning or root elements include Ghaith (غَيْث) and Mugheeth/Mugheeth as variant transcriptions.