E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Namby Pamby Philips.
Ambrose Philips (16711749). His nickname was bestowed upon him by Harry Carey, the dramatist, for his verses addressed to Lord Carterets children, and was adopted by Pope. This was not John Philips, author of the Splendid Shilling. Namby is a baby way of pronouncing Ambrose, and Pamby is a jingling reduplication.
Macaulay says: This sort of verse has been called [Namby Pamby] after the name of its author.