Mount Fitzhenry!

My geography correspondent informs me that the Fitzhenry clan has a mountain named after it in Washington state. Or probably someone called Fitzhenry claimed a mountain. But what's the story behind it?
For a map and aerial shot of our very own mountain click here and select the satellite view, or cut and past this rather long link:
http://washington.hometownlocator.com/maps/feature-map,ftc,1,fid,1519621,n,Mount%20Fitzhenry.cfm

Many thanks to Ann Fitzhenry for this information.