1st Name as Initials? - Boy Names

I’ve always somewhat liked the idea for a boy of going by their first and middle name initials. Like, going strictly or primarily by their initials as opposed to their actual first name. If our last child had been a boy I was really into calling him J.R. for John Russell. He would have been known as “J.R.” though. But alas, she was not a boy, haha.

Anyhow, often we hear combinations like J.T. and P.J. etc… I am curious what other, perhaps less common, initial combinations you have come across or would consider using yourself?

Personally, I have heard of or known the following:
J.R.
C.J.
C.B.
K.J.
T.J.
E.R.
C.T.

Of these, my favorites are CB, CT, and CJ.

Thanks!

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