Was Solomon Grundy (Born on a Monday, Married on Wednesday, Buried on Sunday) a real person?

Solomon Grundy is a fictional character, a zombie supervillain in the DC Comics Universe and as an antihero in the DC Animated Universe. Named after the 19th century nursery rhyme, Grundy was introduced as an enemy of the Golden Age Green Lantern (Alan Scott), but has since become a prominent enemy for a number of superheroes, such as Superman and Batman. He also has ties to DC/Vertigo's Swamp Thing character, vital in the sprout storyline (Swamp Thing #66 November 1987). He first appeared in All-American Comics #61 (October 1944). Solomon Grundy is one of the earliest if not the first depiction of a zombie in the comic medium.
https://en.wikipedia.org/wiki/Solomon_Grundy_%28comics%29

'Solomon Grundy' is an English nursery rhyme first collected by James Orchard Halliwell and published in 1842 with the lyrics:
Solomon Grundy,
Born on a Monday,
Christened on Tuesday,
Married on Wednesday,
Took ill on Thursday,
Grew worse on Friday,
Died on Saturday,
Buried on Sunday.
That was the end,
Of Solomon Grundy.

Over time, several other evolutions, based on the orignal rhyme have appeared.

https://en.wikipedia.org/wiki/Solomon_Grundy

It appears that he was not real at all.

"Solomon Grundy is believed to get derived from the English nutrient Salmagundi, which was integrated into the English word from the French in the 17th century, and is a salad of cooked meats, cabbage, anchovies and eggs, with new condiments. The figure of the salad was corrupted in the 18th century to Solomon Gundy, especially in the United States."

http://www.nursery-rhymes.org/nursery-rhymes/solomon-grundy.html