T.S. Elliot ,the poet. Born 1888
We have a winner! 
Jesus H. Christ
Fun fact: F. Scott Fitzgerald’s full name was Francis Scott Key Fitzgerald. His parents must really have liked The Star Spangled Banner. If I were him, I’d have used “F. Scott Fitzgerald”, too. Or maybe “John Smith”
More names to fit the OP:
H. Allen Smith – American humorist (1907-1976). Almost forgotten today, but popular in his heyday. Wrote “The Year of the Tail” , a fantasy about how humans suddenly acquiring cat-like tails changes culture.
H. Rider Haggard (1856 - 1925) adventure author, wrote King Solomon’s Mines and She
Surely you mean H. Jesus Christ…
J. Wellington Wimpy
Author P. Schuyler Miller
A. A. Milne b. 1882 (author “Winnie the Pooh”)
Q.Q. Switcheroo b. ?
(FTR, my username is from Gödel, Escher, Bach: “The Switcheroo Rule is named after Q. Q. Switcheroo, an Albanian railroad engineer who worked in logic on the siding.”)
Or rather, J. Harold Christ
(I know it stands for Harold because of the hymn, “Hark, the Harold, Angels Sing”)
I knew it! 
H. Ross Perot.
I was wondering how long it would take before ol’ H. Ross was mentioned.
Currently, the earliest names are
L. Frank Baum 1856
H. Rider Haggard 1856
W. Somerset Maugham 1874
A. Philip Randolph 1889
J. Paul Getty 1892
J. Edgar Hoover 1895
F. Scott Fitzgerald 1896
T. Rowe Price 1898
I limited the list to 19th century birth years. Extending it by even 10 years would double or more the length. For the double initial list, I extended it a bit because these names are less common:
J.P. Morgan 1837
A.A. Milne 1882
T.S. Eliot 1888
E.E. Smith 1890
E.E. Cummings 1894
Y.A. Tittle 1926
It’s made even more clear in the Lord’s Prayer.
Our Father, Who art in heaven, Harold be thy name
i always thought that H stood for haploid.
can’t think of any new ones, (of course) but i think a number of these came about because the person was a junior or even in a line of people with the same FN. LN. so always went by a middle name which was different.
W.S. Gilbert 1836 has one year on J.P. Morgan.
L. El Cooljay
T. Herman Zweibel founded The Onion, America’s Finest Newsource, in 1756 so he was probably born before, say, 1730.
W. C. Fields born 1880
H. P. Lovecraft born 1890
Excellent. I’m surprised there aren’t some F.I. people from these earlier years.
Also excellent.
That’s not his name. It’s not even his stage name.
Yeah, in case you haven’t noticed, I’ve ignored fictional people.