What does Advik mean?
A modern Sanskrit-derived name generally glossed as 'unique, one of a kind', linked to the idea of advitiya ('without a second, incomparable'). The further association with advaita ('non-duality') is thematic rather than a direct etymology.
What does Yash mean?
From Sanskrit yashas (यशस्), 'fame, glory, renown, success'. A widely used quality-name meaning 'glory'.