Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
We don't have any stats on how common this name is. This is probably because it's very rare in the UK.
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Related and similar surnamesStewart
The Steuart surname in historical dictionaries
Patronymica Britannica (1860)
STEUART. The Steuarts of Allanton, CO. Lanark (Barts.), are lineally descended from Alexander, sixth lord High Steward of Scotland, great grandfather of King Robert II., the first prince of the Stuart line. Courthope's Debrett.