Sorin

Wiktionary claims that Sorin means “sunflower” in modern Romanian, deriving from soare, and its source (dexonline) backs this up by stating that it means “sunny (place)” or “sunflower”, but I’m having trouble finding other sources to confirm this.

Sorin is said to come from Romanian “soare”, meaning sun, related to the Latin root from which English gets “solar”. There’s a French name Sorin as well, which comes from the French root “sor”, meaning red, or flame, with suffix -in, a diminutive comparable to “of” in English. Then there’s the Scandinavian Søren, which means serious, severe, stern etc. It comes from a similar root from which English gets the word “sore” meaning inflamed, red, etc. And yes, as any etymologist worth his salt would tell you, these names are certainly related.

It's impressive how many comment of the origin of this name from "Soare” :D That is plain stupid.
Simple logic says if that were true, then this should have been a very common Romanian name. And also a very old one. Romanians cannot have discovered this name only in the 19th century (or so)! It looks like it took a lot of time for Romanians to connect the Sun to a name!
In reality, SORIN has Jewish origins in SURIN, which in turn is a variation originating in SARAH. Meaning "lady, princess, noblewoman" in Hebrew. It was and it is an uncommon name in Romanian (a first name) and Russian (a family name).
So no relation whatsoever with the Sun.
No connection to the Danish/Norwegian Søren (from Latin SEVERINUS = severe, serious).
No connection to the Thai Surin (สุรินทร์).

The name is derived from soare (sun in Romanian). Soare is of Latin origin (sol). I suppose that the name was invented in 1852 by the writer Dimitrie Bolintineanu (in the poem “Sorin sau tãierea boierilor la Tîrgoviºte”). In Russian (very rare) it is a family name with absolute different etymology. In other languages is probably only a curiosity.