[kbr2000]

Awk: Aho, Weinberger & Kernighan [0]

Tcl: (an embeddable) Tool Command Language [1]

Forth: FOURTH as in "4th generation software", "successor to 3rd generation compile-link-go languages", or "software for 4rd generation hardware", but IBM 1130 naming cut it short one char [2]

PostScript: after the postfix notation it uses and because it was to be the last thing that happened to an image before it was printed [3]

[0] https://en.wikipedia.org/wiki/AWK

[1] https://wiki.tcl-lang.org/page/Tcl+vs%2E+TCL

[2] https://en.wikipedia.org/wiki/Forth_(programming_language)

[3] https://spectrum.ieee.org/adobe-postscript