What does Yuvan mean?
From Sanskrit yuvan (युवन्), 'young, youthful', and as a noun 'a youth, young man'; the dictionary sense also extends to 'strong, healthy'. A well-attested classical word.
What does Ansh mean?
From Sanskrit amsha (अंश), 'portion, share, part'. Often used affectionately to mean 'a part of oneself' or a share of the divine.