Sir Isaac Newton

Napier, John 8n Neper [Napier], John 8n Neumann, Johann (John) von 114n Newton, Sir Isaac 34n... 

Y, Z, E, P, T, G, and M, the prefixes for 105 and above, are capitalized, as are the symbols whose unit names have been derived from proper names, eg, N for newton (Sir Isaac Newton) and Pa for pascal (Blaise Pascal) an exception is the use of L for liter. 

Newton, Sir Isaac (1979). Opticks. New York Dover. Based on the 4th edition. London, 1730. 

Newton, Sir Isaac (1999). The Principia, Mathematical Principles of Natural Philosophy. Translated by I. Bernard Cohen and Anne Whitman. Berkeley University of California Press. 

---