The harmonic mean is the special case of the power mean and is one of the Pythagorean means. In older literature, it is sometimes called the subcontrary mean. The volume-to-surface area ratio for a cylindrical container with height and radius and the mean curvature of a general surface are related to the harmonic mean.
The name SMITH is probably the most common of all surnames. The only names that give it any competition for this title would be Jones and Johnson. The most widely accepted derivation of the name is from the Anglo-Saxon SMITAN and the Germanic verb âSmioanâ meaning to smite or strike.
If the family name is Smith, then it might be that your great-grandfather was named John Smith, and his son (your grandfather) was Mohammed Smith, and that man's son (your father) was Ali Smith, and you are William Smith, and you might have brothers named Omar Smith and Charles Smith.