Stiernhöök exists since 1649. Johan Olsson, jurist scholar, became nobilitated in that year and took the name Stiernhöök. There is nothing of new-age-nonsense to it, though. It is a typical nobility-name.
Stjärna = 'star'
Hök = 'hawk'
Names that nobilitated persons took often contained elements like:
Krona = 'crown'
Lejon = 'lion'
Lilje = 'lily'
Gyllen = 'golden'
Sparre = 'spar'
Svärd = 'sword'
Stjärna 'star'
Örn = 'eagle'
etc, etc,
and this style was frequently imitated by others, non nobilitated persons.
http://www.lysator.liu.se/runeberg/sbh/b0530.html