What does Rion mean?
Rion /ri-on/ [2 sylls.] as a name for boys is of Gaelic origin, and Rion means "king". Rion is a version of Ryan (Gaelic): also possibly (Gaelic) "water". Roon is a conventional last name.
How popular is Rion?
Rion is an unusual given name for men but a very prominent surname for both adults and children (#33653 out of 150436, Top 22%). (2000 U.S. Census)
Shown below is an analysis of the usage of Rion and related names. Ryan (#37 a year ago), Ryne and Rian are the prominent related forms of Rion (not in Top 1000). Forms like Rien are uncommon. These boy names were at the apex of their popularity in the year 1990 (usage of 0.4543%) and have become much less widespread since (usage 0.321%, down 29.3%), with the form Ryne becoming less in vogue. Ryan (#37) is the most fashionable baby name here. (Top 1000 Baby Names Records, 2014)
Rion is pronounced similarly to Rain, Ren, Roan, Ron▼, Ronn and Roone. Other recommended similar baby names are Dion▼, Eion, Lion, Rio, Sion and Zion▲. These names tend to be more commonly used than Rion.