This is the 14399th most frequent Spanish word.
vivan
"Vivan" means "live" (third-person plural subjunctive form of "vivir").
Here, 'vivan' is used in the subjunctive mood to express a wish, specifically cheering or celebrating the happiness of the newlyweds.
¡Vivan los novios!
Long live the newlyweds!
In this case, 'vivan' is used in the subjunctive mood to indicate uncertainty or possibility about their residence.
Es posible que ellos vivan cerca de aquí.
It's possible that they live nearby.
Here, 'vivan' is used in the subjunctive mood to express a desire or hope for their happiness.