If you wanted something similar, and perhaps your parents might also like and could be easier for your family/friends to switch to (hey, added bonus, right?) have you considered [name_u]Cato[/name_u]? Similar to [name_f]Caitlyn[/name_f] in sound obviously but definitely a masculine name. It means “all-knowing” and is a nod to you knowing yourself best.
I might also suggest [name_u]Ellis[/name_u]. It means “benevolent” which is well meaning or kindly. [name_u]Ellis[/name_u] O’[name_u]Connor[/name_u] has a nice ring to it.
Julian means “sky-father” which is a classic name and also has the astronomy meaning you’re looking for.
Vaughn is similar in sound to [name_u]Sean[/name_u] but definitely less common.