Mu'tamid
Yes. Mu'tamid is historically attested; the best-known bearer is Al-Mu'tamid ibn Abbad, ruler and poet of Seville in 11th-century al-Andalus.
Mu'tamid comes from the root related to i'timad (reliance) and generally means 'one who is relied upon', 'dependable' or 'trusted'.
No. The personal name Mu'tamid does not occur as a proper name in the Quran; its semantic root and related verbs do appear in classical Arabic usage.
Common phonetic rendering is mu'-TA-mid (Arabic: مُعْتَمَد). The apostrophe indicates the glottal stop from the hamza in classical Arabic articulation.
Yes. While rare, Mu'tamid is a historically grounded Arabic name with strong connotations of trust and reliability and may be chosen by families seeking a classical, meaningful name.