"Ousterhout's original 1990 USENIX paper on Tcl did actually specify the pronunciation as the word Tickle, rather than T-C-L." [L1 ] "'Tai4 ku4' (太酷 \u592a\u9177) is an acceptable Mandarin Chinese pronunciation."
It was a good decision to invent tcltest rather than, say, "testtcl". Or, better yet, do not say the latter, at least in English.