Tillie

Tillie is a girl's and boy's baby name of Germanic origin, a diminutive of Matilda, from the Old High German Mahthildis, composed of maht (might, strength) and hild (battle), meaning 'mighty in battle.'

Tillie has the irresistible quality of old-fashioned British nicknames that have become proper names in their own right — warm and slightly cheeky, with a literary charm found in characters from Victorian novels. It's in great company alongside Millie, Billie, and Nellie as part of the -ie suffix revival sweeping through current naming trends.