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My fist association was "kentron" / "centrum" (goad, peg, centre). But the I found this:

Hispanic (Puerto Rico; Cintrón): unexplained; perhaps a nickname from a variant of Spanish cinturón ‘belt’.

http://www.ancestry.com/search/SurnamePage.aspx?sourcecode=13304&html=b&fn=&ln=Cintron&submit.x=0&submit.y=0