I doubt Oda would continue with the same word play 'til the end of the series. The one you mentioned is already famous enough for Oda to change things around a bit, as it's been mentioned in one of his SBSs, or else it would be too easy for people to guess the next Strawhat member. It'd make more sense if he went in a different direction now.
One example is number endings, or also known as counter words. A counter word is basically a way to express the number of a particular object. Though they have many different endings to choose from, depending on what they're counting, which makes it even more interesting. It's similar to 'two cups of tea' or 'five pairs of socks', but not quite the same.
Here are some examples with the number '5':
Go-sai
Go-hon
Go-kai
Go-biki
Go-ten
Go-kaku
Go-nen
Go-satsu
There are a few more, but you get the point. You can actually find the Hobi Hobi no mi in there (Hon + biki), the name of Sugar's fruit. The interesting part about this is the meaning of these two endings. 'Hon' is the word for long objects, and Biki is for small things, like animals or perhaps your favorite toy. Sugar is obviously a small girl, at least physically, who's now come to hate long things. Coincidence? Perhaps.
My opinion about this is probably pretty biased, considering how much I want Sugar to join, but it's still something I find interesting. Still, word plays are word plays, which shouldn't be taken seriously, until they're confirmed to be used commonly in the series.