What does Tanvi mean?
From the Sanskrit तन्वी (tanvī), 'slender-bodied, delicate', from tanu ('body, slender'). Recorded as an epithet of the goddess Durga.
What does Jiya mean?
Hindi jiya (जिया), 'heart, soul, sweetheart', a colloquial term of endearment; also connected to jina 'to live'.