Jesus is the Medieval Latin spelling of Iesus (the 'i' is consonantal), itself derived from the Greek Ἰησοῦς, as bleh noted, which transcribed in Latin characters would be Iesous, close to your Iseous (which does not otherwise exist as a name).
The name is ultimately Semitic, and came into Greek as the Aramaic שׁוּעַ (Yeshua), from the Hebrew יְהוֹשֻׁעַ (Yehoshuah, which in English we usually "translate" to Joshua).
There is no relationship between that name and Zeus, which is proto-Indo-European and only looks similar to Iesus in its late form—its stem is dio- (whence Dios "of Zeus", and its many derivatives in names like Dionysus and Diomedes or even Dioscuri, the two "sons of Zeus"). This name ultimately comes from the PIE root * _dewos_ , and is related to the Latin _deus_ , Old Persian _daiva_ -, both words for god, as well as the Latin _dies_ or Russian день (dyen') meaning "day".