Sun – “Eke” is an Old English word meaning “also.” Hence, another name you went by was called “an eke-name,” which eventually morphed into “a nickname.”
Mon – Using the name “John Doe” for an anonymous or identity-protected person traces back to an abandoned British legal procedure called an “action of ejectment.” Due to legal complexities, the process often moved faster when fictitious names were used to more quickly determine the rights of the real-life parties, and “John Doe” was frequently the fictitious plaintiff and “Richard Roe” the fictitious defendant. Exact reasons for the use of these names are unclear, but John and Richard were (and still are) common English names, and “doe” and “roe” are both deer-related terms: a doe is a female deer, and roe a Eurasian deer species widespread in England. More recently, “Jane Doe” became the female equivalent of “John Doe,” though the also-anonymous “Roe” made it into the landmark US Supreme Court abortion case of Roe v. Wade before the plaintiff later revealed her real name.
Tue – “Santa Claus” is derived from “Sinter Klass,” the Dutch nickname of Sint Nikolaas, or Saint Nicholas.
Wed – It wasn’t until the year 1066 that the idea of last names really caught on in England, and many of the last names now common in the US began simply as ways to identify who’s son somebody was (Johnson, Anderson, Robertson, etc.) or what their profession was (Smith, Miller, Baker, Taylor, Potter, Cook, Mason, Cooper, etc.). Notably, many hispanic surnames also indicate a father’s name (Rodriguez = son of Rodrigo, Hernandez = son of Hernando, etc.).
Thu – Among Western cultures, the practice of giving a child a middle name was far rarer before the the 1700s, except to indicate a higher status in society (such as in old Rome) or among cultures who included a lot of earlier generation’s family names, like Arabic and Spanish names. Later, Europeans’ options for the occasional middle name were either a saint or ancestor, but by the 1800s, middle name choices were wide open in the US and Europe. By WWI, middle names were common in Western cultures and remain so.
Fri – All living species, once discovered by science, are given a scientific or Latin name in addition to their common name. You are a modern human, AKA homo sapien sapiens. The scientific name of a newly discovered or named species is often chosen in honor of someone and is then Latin-ized. Among the many famous people with species named for them (and often insects and spiders) are Arnold Schwarzenegger, Mick Jagger, David Attenborough, Lada Gaga, Matt Groening, Liv Tyler, Johnny Cash, Steven Colbert, Harrison Ford, and quite a few political leaders and Greek philosophers.
Sat – In China, one term for “commoners” translates to “the old 100 surnames.” While there are now over 4,000 family names in China, the top 100 cover an amazing 85% of the population. The ten most common are Wang, Li, Zhang, Liu, Chen, Yang, Huang, Zhao, Wu, and Zhou.