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cognomen (n.)

1754, "a distinguishing name;" 1809, "a surname;" from Latin, from assimilated form of com "with, together" (see com-) + (g)nomen "name" (from PIE root *no-men- "name"). The last of the three names by which a Roman citizen was known (Caius Julius Cæsar, Marcus TulliusCicero).

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