From the Roman cognomen Iuvenalis
which meant "youthful" in Latin. Juvenal was a Roman satirist of the 1st century.
JU-WONm & fKorean
From Sino-Korean 周 (ju)
meaning "circumference" combined with 元 (won)
meaning "first, origin" or 媛 (won)
meaning "beautiful woman". Other hanja character combinations are possible.