Stephen Vincent Benét: American Name?

Stephen Vincent Benét
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I'm still trying to pinpoint precisely what Stephen Vincent Benét's 'Americanism' consisted of, and where might one better look than at his 1927 poem "American Names":

American Names

I have fallen in love with American names,
The sharp names that never get fat,
The snakeskin-titles of mining-claims,
The plumed war-bonnet of Medicine Hat,
Tucson and Deadwood and Lost Mule Flat.

Seine and Piave are silver spoons,
But the spoonbowl-metal is thin and worn,
There are English counties like hunting-tunes
Played on the keys of a postboy's horn,
But I will remember where I was born.

I will remember Carquinez Straits,
Little French Lick and Lundy's Lane,
The Yankee ships and the Yankee dates
And the bullet-towns of Calamity Jane.
I will remember Skunktown Plain.

I will fall in love with a Salem tree
And a rawhide quirt from Santa Cruz,
I will get me a bottle of Boston sea
And a blue-gum nigger to sing me blues.
I am tired of loving a foreign muse.

Rue des Martyrs and Bleeding-Heart-Yard,
Senlis, Pisa, and Blindman's Oast,
It is a magic ghost you guard
But I am sick for a newer ghost,
Harrisburg, Spartanburg, Painted Post.

Henry and John were never so
And Henry and John were always right?
Granted, but when it was time to go
And the tea and the laurels had stood all night,
Did they never watch for Nantucket Light?

I shall not rest quiet in Montparnasse.
I shall not lie easy at Winchelsea.
You may bury my body in Sussex grass,
You may bury my tongue at Champmedy.
I shall not be there. I shall rise and pass.
Bury my heart at Wounded Knee.

Are the most American names the odd ones derived from British English but given an oddball American twist? Not only. Consider John Brown's Body, published a year later (1928):

Call up the American names,
Kagi, the self-taught scholar, quiet and cool,
Stevens, the cashiered soldier, bawling his song,
Dangerfield Newby, the freed Scotch-mulatto,
Watson and Oliver Brown and all the hard-dying.

The name "Kagi" doesn't sound typically American, but the others certainly do. Or did. But what about Stephen Vincent Benét's own family name . . . did it sound 'American'? Was he overcompensating?