500 Home Run hitters grouped by last name initial. Which last initial has the most?

27 players have hit at least 500 career home runs. Which last initial has the most? Hint: half of them played almost the same years.

Here are the 27 players in a matrix of the 26 letters of the alphabet:

		1	2	3	4	5	6
A	1	Aaron
B	2	Banks	Bonds
C
D
E
F	1	Foxx
G	1	Griffey
H
I
J	1	Jackson
K	1	Killebrew
L
M	6	Mantle	Mathews	Mays	McCovey	McGwire	Murray
N
O	2	Ortiz	Ott
P	2	Palmeiro	Pujols
Q
R	4	Ramirez	Robinson	Rodriguez	Ruth
S	3	Schmidt	Sheffield	Sosa
T	2	Thomas	Thome
U
V
W	1	Williams
X
Y
Z
	27	1	2	3	4	5	6

Here are the Ms alphabetically by last name:

Mickey Mantle	536	1951	1968
Eddie Mathews	512	1952	1968
Willie Mays	660	1951	1973
Willie McCovey	521	1959	1980
Mark McGwire	583	1986	2001
Eddie Murray	504	1977	1997

Mantle, Mathews, Mays overlap almost completely in years and McCovey about half the years. The Rs are next with four players:

Manny Ramirez	555	1993	2011
Frank Robinson	586	1956	1976
Alex Rodriguez	696	1994	2016
Babe Ruth	714	1914	1935

S is the only other letter with more than two:

Mike Schmidt	548	1972	1989
Gary Sheffield	509	1988	2009
Sammy Sosa	609	1989	2007