How do you say "Happy New Year" to your Jewish friends during Rosh HaShanah, the Jewish New Year? The answer is simple: "L'Shana Tova," which literally means "For a Good Year."
Rosh Hashanah is the Jewish New Year and is a major holiday on the Jewish calendar. In addition to "L'Shana Tova," there are several other things you can say to someone celebrating Rosh HaShanah. For instance, you could simply say "Happy New Year" or "Happy Holiday." In Hebrew, "Happy Holiday" is "Chag Sameach" and in Yiddish it is "Gut Yontiff."