I'll bet whoever came up with these guys did:
(that is a big squig)
The Indo-European roots section of my desk dictionary (AH4) also tells me that the root mer- is also the source of, PREMORSE (an awesome word I didn't know--shame it doesn't mean 'regretting something before you do even it'), AMARANTH, MORBID, and possible MURDER, FOMORIAN, and MANTICORE.
Not to mention MURRAIN and MORTGAGE.
Have I mentioned that I love dictionaries?