Egbert
A surname from an old personal name meaning “famous” or “bright,” ultimately of early Germanic origin.
The #6,651 most common surname in the United States (2010 Census) — about 1 in every 60,669 Americans shares it.
Etymology
Egbert comes from an old personal name found in early English and continental Germanic use. The name is usually explained from Germanic elements meaning “edge/sword” or “bright, famous,” though the historical dictionaries in your excerpts gloss it simply as “always bright, famous.” As a surname, it developed from the given name rather than from an occupation or place-name.
History
The name is ancient in England because it was borne by Egbert, a West Saxon king of the 9th century. As a hereditary surname, it later appears in English and especially Germanic-family naming patterns, with related forms such as Ebbert and Egberts. Some 19th-century writers treated it as an old Saxon personal name rather than as a common surname origin in itself.
Origin
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Fun fact
One historical source in your set glosses Egbert as “always bright, famous,” showing how Victorian etymologists often paired names with very literal-sounding meanings.
From the historical record
“EDMOND. (Sax.) Happy peace. EDWAED. (Sax.) Happy keeper. EGBERT. (Sax.) Always bright, famous. EGGLESTOK (Welsh or Br.) From Egles, a church, and tun or dun, a hill — the church on the hill EIGINN. (Gaelic.) Strong-handed. ELDRED. (Sax.) All reverent fear. ELI. (Heb.) The offering or lifting up. ELIAS. (Heb.)…”
— An Etymological Dictionary of Family and Christian Names