What was the original Celtic name of the holiday?

The original Celtic name of the holiday now known as Halloween is Samhain. Samhain was celebrated by the ancient Celts to mark the end of the harvest season and the beginning of winter, typically observed from October 31st to November 1st. It was believed to be a time when the boundary between the living and the dead was blurred, allowing spirits to cross over. The festival included various rituals and celebrations to honor the deceased and welcome the darker half of the year.