Compare Wikipedia's table of the relative frequencies of initial letters in English.
$ dig axfr . @f.root-servers.net | perl -ne ' next unless /^(([a-z])[a-z0-9-]+)[.][ ].*/; $label{$1} = 1; $letter{$2}++; $total++; END { for my $x (sort keys %letter) { my $p = 100.0*$letter{$x}/$total; printf "<tr><td>$x</td> <td align=right>%5.2f</td> <td><span style=\" display: inline-block; background-color: gray; width: %d;\"> </span></td></tr>\n", $p, 32*$p; } }'
a | 5.24 | |
b | 5.96 | |
c | 10.02 | |
d | 2.45 | |
e | 3.28 | |
f | 2.43 | |
g | 5.03 | |
h | 1.78 | |
i | 3.38 | |
j | 1.14 | |
k | 2.71 | |
l | 3.74 | |
m | 6.69 | |
n | 4.26 | |
o | 0.72 | |
p | 5.68 | |
q | 0.65 | |
r | 2.81 | |
s | 6.15 | |
t | 6.02 | |
u | 1.91 | |
v | 2.66 | |
w | 1.94 | |
x | 12.19 | |
y | 0.41 | |
z | 0.75 |