Tilly is associated with the meaning “Mighty in battle, strength in war” — a beautiful sentiment to see brought to life in your child’s room.
Tilly is a diminutive of Matilda, a name with Old Germanic roots. It comes from the elements "maht," meaning "might" or "strength," and "hild," meaning "battle." So at its core, Tilly carries the literal translation of "mighty in battle." It entered English through Norman French after the 11th century.