As the chart below shows, the number of programming languages beginning with a certain letter varies as much as 10x by letter.
Below is the same list, sorted by popularity.
A curious observation: why are A and C both ~3x more popular than B?
Data used for these charts:
firstLetter,n a,59 b,22 c,75 d,20 e,28 f,38 g,30 h,15 i,23 j,27 k,15 l,45 m,57 n,31 o,30 p,69 q,10 r,33 s,76 t,24 u,13 v,13 w,9 x,10 y,4 z,6