What does Charvi mean?
From Sanskrit charvi (चार्वी), feminine of charu (चारु) 'beautiful, lovely, pleasing to behold'. Well established.
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.