Mayim is the Hebrew word for water. You can learn more here about why we chose that name for our TBS elementary learning program.
Tamid is Hebrew for always, continual, or eternal. The word was first used in the Torah to refer to the daily offerings (olat tamid) of our Biblical ancestors, and it is still used today to refer to the eternal light (neir tamid) that hangs above the ark in Jewish sanctuaries. Since the children in Mayim Tamid attend with more frequency than the children in our flagship Mayim program, we added this word to signify their more perpetual presence.