Dash
Likely a topographic surname for someone who lived by an ash tree or an ash-wood, though some early writers also linked it to French place-name forms.
The #8,599 most common surname in the United States (2010 Census) — about 1 in every 80,655 Americans shares it.
Etymology
This surname is probably from a place-description involving ash trees: Old English "æsc" for ash and related forms meaning "at the ash" or "by the ash-wood." Early surname scholars also suggested a French-looking form such as "D'Ash" or "D'Assche," but they treated the English ash-tree explanation as the likeliest source. In short, the name most likely began as a local identifier for someone who lived near an ash tree or ash grove.
History
19th-century surname dictionaries record Dash as rare and often discuss it alongside Dashwood, which was thought to come from a similar "ash-wood" place-name. Some authors connected it with continental forms like D'Assche, but that was more conjectural than the ash-tree explanation. The surname survives chiefly in England and in English-speaking countries through later migration.
Origin
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Fun fact
Some older etymologists even compared Dashwood to a medieval Latinized surname meaning "of the ash grove," showing how closely early surname studies tied the name to landscape features.
From the historical record
“DASENT. See Decent. DASH. Possibly from De Ash, a local name. DASHWOOD. I cannot find any locality so called, but the name may have been originally De Ashwood, then D'Ashwood, DAV 83 and finally Dashwood. This wonld an-”
— Patronymica Britannica: a dictionary of the family names of the United Kingdom