Look to none other than John Tukey, inventor of the fast Fourier transform, for coinages with backwards syllables: spectrum --> cepstrum, frequency --> quefrency, analysis --> alanysis, ...
All of these come from his landmark paper on the analysis / alanysis of seismic data using frequency analysis of frequency data (two levels of frequency analysis).
Tukey's coinage of the "bit", his invention of the FFT, his work on exploratory data analysis, and his Bell Labs career are legendary, but his coinages are certainly obscure. Practitioners and researchers working in the area of automatic speech recognition have adopted the "cepstrum" for audio signal analysis.