We don't have synonyms for hellun yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are hellen and hellin.
(n) :
(Greek mythology) the mythological patriarch of the Hellenes, the son of Deucalion (or sometimes Zeus) and Pyrrha, brother of Amphictyon and father of Aeolus, Xuthus, and Dorus
(n) :
(Greek mythology) the mythological patriarch of the Hellenes, the son of Deucalion (or sometimes Zeus) and Pyrrha, brother of Amphictyon and father of Aeolus, Xuthus, and Dorus