Is the first name Marx a shortened version of Mordecai #names

Phil Goldfarb

Trying to clear up a puzzle. Does anyone know if the first name Marx (which was found on a death certificate) was a shortened version of Mordecai (a potential relative which was found on a tombstone) They were all from Lithuania.
Thanks for any help
Phil Goldfarb
Tulsa, OK

GITOVICH (Gitow) -Belarus-Ukraine, LIT (Leet)-Lithuania, MERIN (Belarus) BRAUN (Lithuamia), GRUBER (Austria), GOLDFARB (Poland), FROUG  

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