Fuddy-duddy

Entry in progress—B.P.
     
Wikipedia: Fuddy-duddy
A fuddy-duddy (or fuddy duddy or fuddy-dud) is a person who is fussy while old-fashioned, traditionalist, conformist, or conservative, sometimes almost to the point of eccentricity or geekiness. It is a slang term, mildly derogatory but sometimes affectionate too and can be used to describe someone with a zealous focus on order.
 
Refer to Gladwin’s Men out of Asia (1947) for “Dr. Phuddy Duddy,” modeled after a prominent anthropologist who poo-poos his theories.
   
Etymology
“Fuddy-duddy” is considered a word based on duplication and may have originated as a fused phrase made to form a rhyming jingle. Duddy is similar to Daddy and may have caught on from children’s rhyming.
 
(Oxford English Dictionary)
fuddy-duddy, n.: 
Etymology: Origin unknown.
An old-fashioned person; an ineffectual old fogy. Also attributive or as adj.
[1899   E. W. Prevost Dickinson’s Gloss. Words & Phrases Cumberland (new ed.) 106/2   Duddy fuddiel, a ragged fellow.]
1904   in H. Wentworth Amer. Dial. Dict. (1944) 236/2. 
1907   Dial. Notes 3 244   Fuddy-duddy, n. and adj.
1938   D. Moffat Mott Family in France xvii. 191   Mr. Mott wandered along the Promenade..looking at the damned old fuddy-duddies who cluttered it up.