A Scottish habitational surname derived from a place name meaning "fort of Rydderch" in Old Welsh.
In the 1881 census there were 97 people recorded with the Caruthers surname, ranking it #20,127 among surnames in the records. By 2016, the modern count was 17, ranked #36,904, down from #20,127 in 1881.
The strongest historical links point to Lanchester (Collierley, Kyo, Billingside, Medomsley, Ebchchester, Benfieldside, Heelyfield, Conside, Carlisle St Cuthbert and Govan Combination. In the modern distribution records, the strongest local clusters include No data.
Across the surname records, the highest recorded count for Caruthers is 195 in 1861. Compared with 1881, the name has fallen by 82.5%.