You are mistaken about most of them having those endings, the majority of Zanpakutō do not have that ending. It is not uncommon for Zanpakutō names (like people's names) to share some elements. "Maru" is a common ending for a male name, like Ichimaru. If you are getting "etsu" from Zangetsu and Engetsu, it is "getsu", not "etsu" and it means "moon". You can see a list of Zanpakutō on the Zanpakutō page on Bleach Wiki and compare the names and their meanings there. They are all provided for you there.
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