The name Tillie is a girl's name of English origin meaning "battle mighty". Tillie and is often added to lists like Nicknames for Baby Girls and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
A surprise recent hit revival with cutting-edge British, Tribeca and Malibu parents; Tillie, also spelled Tilly, is cute, frilly, and sassy all at once. Tilly is currently Number 90 on the England-Wales popularity list, joining such other Top 100 nickname names as Milly, Maisie, Kitty and Lottie. Tillie along with these other short forms transform proper names rooted in other cultures into true English names for girls.
Writer Tillie Olsen is a feminist favorite. Tillie's Punctured Romance is a classic Mack Sennett silent film, starring Charles Chaplin, Mabel Normand and Marie Dressler; Tillie the Toiler was an iconic flapper comic strip.