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 Ayush mean?
From Sanskrit ayus (आयुस्), 'life, vital power, long life, longevity'. A blessing-name wishing the child a long life.