Can middle names be a link to a place or to another ancestor?

Question

Is 'Warren' a common middle name from a particular country? Another common middle name shared in my family is 'Waldo'.  Perhaps they are place names?  Or would I want to search using these middle names as the first name along with my surname? Thank you!

Comments

I think all forenames can be linked thusly.  My uncle, for example, was given the last names of two ancestral lines for his forenames.  (My Mum always said he was fortunate they both worked.) 
I have also run across numerous people who named their children for places they lived, or where their parents had lived, or just a place name they liked (Indiana, Madison). 
Often, if you search back for the origins or the place names, they, too, are linked to someone's last / family name.  Brisbane, Queensland, Australia (and, no, you do not pronounce that as Bris-bayne, more as Brizbn), was named for Sir Thomas Brisbane, a former Governor of the Colony of New South Wales.  Adelaide, South Australia, was named for Queen Adelaide, but there have been folk who liked the name and named their children for the city, not the Queen.

Answer 1

I have found that very often the middle name is a nod to the mother's maiden name or the name of a grandparent on either side. It could be the first name of a close relative as well. This is where I look first.  

Sometimes its just the popular name of the year or era, a lot of kids were named for past presidents, or notable public figures.   

I have also run across some that have named their kids after locations, but not as often as naming after a close relative.