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In the US the "estate" car is the "station wagon" although very few of those are made any more. I am yet to grasp the difference between an estate and a shooting break here although that is probably a simple nomenclature choice by the manufacturer.
The "Estate" name probably is a shorter version of "Country Estate" to hark back to the more rural origins of the design. So they were basically channelling the whole Ranch theme from the 50s (Ranch Style houses).
Car names and pharmaceutical names are weird if you think about them too hard.
I was a bit puzzled by the El Camino on previous page as on the front wing its marked 'estate', not what we'd call an estate. The rest of the family kind of expects a roof and a bit of shelter from the elements over here :). Part of me wishes that under that cover lurks an avocado hot tub to complete the 70's vibe.
And yes they had those Subaru pickups over here, beloved of farmers across the land. Though I don't remember them being called the Brat, think it was just called a Subaru 1800 in the UK.