What does Devansh mean?
A compound of Sanskrit देव (deva, 'god, divine') + अंश (aṃśa, 'portion, part'), read as 'a part/spark of God'. The elements are genuine Sanskrit, though the compound itself is a modern coinage used as a name rather than a classical term.
What does Dev mean?
From Sanskrit deva (देव), 'god, deity, divine one', from a root meaning 'to shine'. A simple, ancient word meaning 'divine'.