In December, 1951, Mrs. Bernice Nixon of Chicago found an abandoned baby boy on her doorstep, in the snow. She and her family dubbed the abandoned baby Zero, “after the prevailing temperature.”
The baby was soon taken to an orphanage and presumably renamed, though you never know — people have indeed gone through life with the name Zero. The SSDI lists nearly 50 Zeros (over 20 of which were born in either North or South Carolina, strangely).
Source: “Door-Step Baby Is named “Zero.”” Spokane Daily Chronicle 22 Dec. 1951: 11.