Hymenaios
Ὑμέναιος
The god of marriage, whose name was called out at every wedding.
Ancient Greek wedding processions rang with the cry "Hymen! Hymenaios!"
The word also meant the wedding song itself, so from the very start it is blurry whether he is a god or a song.
A marriage where his name went unspoken, people believed, was doomed to end unhappily.