rā, kāf, sīn
3 names share this root — every one of them carries a thread of the same meaning.
Arax is an Armenian name for boys and girls. It is the name of a river that flows through Armenia and other countries, commonly called Aras. Arax is derived from the Greek name of river, which is Araxes.
No independent English meaning found for this name in these sources. Its Arabic spelling matches a real word in the Quran — see the citation below.