Mattie sits at rank 1675 with 61 female-leaning pet registry entries. It's a name with a distinctly American frontier register — most famously worn by Mattie Ross, the iron-willed protagonist of Charles Portis's novel True Grit — and it arrives in pet naming via the warm, slightly old-fashioned nickname tradition that is quietly fashionable right now.
The True Grit Connection
Mattie Ross is the narrative voice and moral center of True Grit (novel 1968, films 1969 and 2010). She is fourteen years old, relentlessly determined, and utterly without self-pity — a character so specific and vivid that the name Mattie carries her qualities for anyone who knows the story. The Coen Brothers' 2010 adaptation brought True Grit back to wide visibility. Pet owners who love the name often cite this character specifically. Daisy and Rosie are neighbors in the warm-American-girl register without the frontier edge.
Nickname and Human-Name Origins
Mattie is a diminutive of Martha (Hebrew, meaning "mistress of the house") or of Matilda (Germanic, meaning "mighty in battle"). Both source names are enjoying a quiet revival in human naming, which means Mattie is picking up cultural currency from two directions at once. On the human side, Mattie has been a steady if low-frequency presence in SSA data. Basset Hounds and Beagles get warm, classic nickname names like Mattie with some regularity.
The Counter-Read
Mattie reads as gentle and slightly vintage. Owners who want something edgier or more contemporary will find it too soft. For owners who love the frontier spirit and the classic nickname register, it's close to perfect.