How do you say merry Christmas in Maltese?

Dio ti benedica! is an Italian equivalent of the English phrase "God bless you!"

Specifically, the masculine noun Dio is "God." The object pronoun ti means "(informal singular) you." The present imperative benedica translates as "(he/it/one/she) bless" in this context.

The pronunciation will be "DEE-o tee BEY-ney-DEE-ka" in Italian.