What does Rien mean?
Rien /rien/ as a name for boys is of Latin and Gaelic derivation, and the meaning of the name Rien is "of the sea; king". Rien is a version of Marino (Latin). Rien is also a variation of Ryan (Gaelic): also possibly (Gaelic) "water".
How popular is Rien?
Rien is a rare first name for males but a somewhat popular last name for all people (#96480 out of 150436, Top 64%). (2000 U.S. Census)
Below is a graphed comparison of the usage of the boy name Rien and corresponding names. Rian, Ryan (#37 2 years ago) and Ryne are the popular alternative forms of Rien (not in Top 1000). Other forms, like Ries, are uncommon. Adoption of these forms of Rien was well-received in 1990 (usage of 0.4543%) and is somewhat lower today (usage 0.321%, ▼29.3%). Ryan is more familiar than the rest, while Ryne is now less popular. (Top 1000 Birth Names Statistics, 2014)