What does Riddhi mean?
From the Sanskrit ऋद्धि (ṛddhi), 'prosperity, success, abundance, good fortune'. In one Puranic tradition Riddhi is a consort of Ganesha (paired with Siddhi), though Ganesha's marital status varies across texts.
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'.