A Russian name (female form of Misha), or in some contexts, a traditional Russian wooden hammer or mallet used in crafts.
The personal name is a diminutive of 'Maria,' common in Russian and other Slavic languages. The tool meaning derives from Russian folk traditions where 'masha' referred to various hand tools used in woodworking and traditional crafts.
In Russian culture, Masha is so commonly used for girls that it's like how English speakers use 'Jane' in generic sentences—'Masha and Vanya' is how Russians tell example stories, making it almost a cultural shorthand for 'a typical person.'
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