What does Nishka mean?
From the Sanskrit निष्क (niṣka), an ancient gold coin, and by extension a golden necklace or ornament — attested in the Manusmriti and other classical texts. Popular 'pure/honest' glosses on name sites are not supported by the classical sources.
What does Ishita mean?
From the Sanskrit ईशिता (īśitā), 'superiority, supremacy, lordship' — one of the eight siddhis (mystic powers) in yogic tradition. Commonly rendered 'one who desires to rule' or 'preeminent'.