Technically, yes. Dunedain only means "a chieftain of Numenor" or 'man of the West". But after 40 generations between Elendil and Aragorn and there being few Dunedain left, the desire to marry Numenorean, intermarriage, and statistics would it have made it near impossible for a Dunedain from Aragorn's time not to have some ancestral link back to Elendil.
For fun let's try the math. (It's a boring Sunday night and I'm a genealogy fan, so this is fun for me. I'm really trying not to be annoying.)
Every Dunedain of Aragorn's time had two parents, 4 grand parents, 8 great-grandparents...
Let's see that's 2 to the thirty-eighth power grandparents back to Elendil's generation...
1,099,511,627,776 = ~1.099 trillion great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-great-grandparents for each Dunedain.
Given the small size of the remaining Numenorean community and the great desire to have Numenorean bloodlines, one of those 1.01 trillion ancestors is bound to be Elendil, if not many, many times more than once. He's just not necessarily the paternal-paternal-paternal... (x38)... grandfather.
All the Dunedain were descendants of Elendil of some sort. It would be near impossible not to be -- especially amongst the chieftain class.
Again, I'm not trying to be annoying. I'm just bored and have a computer. I don't think Tolkien even gave this much thought or he would have put fewer generations between Aragorn and Elendil.