I was going down a Wikipedia rabbit hole and reading about Aethelred/Ethelred the Unready, and noticed ten of his thirteen children had names starting with E. A look at the Wessex family tree revealed that from 519 - 750 AD, almost every single ruler's name started with C, after which they switched to E. Is there a reason for this alphabetic consistency?
Anglo-Saxon names, like many traditional Germanic names, were usually composed of two elements, and there were certain name elements that were very common, particularly in the House of Wessex.
For example, Aethelred's name is composed of two elements æthel, meaning "noble", and ræd, meaning "advice", thus "Noble Advice". For obvious reasons, æthel was an extremely common component in royal names; for example, Aethelred's eldest son and heir-apparent, Aethelstan (æthel and stan "stone"), as well as his ancestors Aethelwulf, Aethelbald, and Aethelbert.
Demonstrating the connection to the larger Germanic naming tradition, this element is also found in the German name Albert, which had the older form Adalbert, composed of the Old German elements adal, cognate to æthel, and beraht, meaning "bright", which is also found in Robert and many other older German names.
Another common element beginning with "Ae" was ælf, meaning "elf" (the mythological creature); for example, Alfred the Great's name was composed of ælf and ræd. You can also see this element in the name of Aethelred's daughter Aelfgifu (gifu meaning "gift").
For the letter "E", a common element was ead, meaning "prosperity" or "riches"; for example, Aethelred's more famous son, Edmund Ironside's name is composed ead, and mund, meaning "protection". You can also see this element in the names of the various famous kings called Edward (including Aethelred's son, Edward the Confessor, the last king of England from the House of Wessex), composed of ead and weard, meaning "guard" (related to modern English "ward"). Aethelred must have especially liked this element, since it's also found in the names of his sons Eadred, Eadwig, and Edgar (Eadgar), and his daughter Edith (Eadgyth).
My source for much of this is the Nordic Names Wiki, which isn't exactly a scholarly source, but it is an excellent compendium of information on Germanic names, especially Norse and modern Scandinavian names.
And if you're interested in more Anglo-Saxon names, you can find some good name lists and other info in the Medieval Names Archive from the Academy of Saint Gabriel, which compiles information on historical names and heraldry for re-enactors.
This is probably pretty insignificant, because there are probably thousands upon thousands of us, but my brother and I were looking into it and found out that Aethelred "The Unready" was very probably my 26th great grandfather. Off topic and late to the party, I know, but wicked cool if you ask me.