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Ted rule
(files.mastodon.social)
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Tweet by San Antonio Express-New, saying: "Sen. Rafael Edward Cruz, who uses the preferred name Ted, has introduced a bill to limit the use of preferred names and pronouns."
Ted is a nickname for Edward. Don't ask me how, but it is.
In medieval England it was trendy to make nicknames by rhyming with a shortened form
Robert -> Rob -> Bob
Richard -> Rick -> Dick
Margaret -> Meg -> Peg
William -> Will -> Bill
All being pretty common examples. This was covered pretty early on in the excellent History of English Podcast
That explains my Aunt Peggy.