Mac-Mahon is not a name that would make you immediately think "French!" when you come across it, but this is indeed the Avenue Mac-Mahon in the 17th arrondissement of Paris, running roughly NNW for about 402 metres before coming to an end at the l'avenue des Ternes. If French Wikipedia is to be believed, it is 36m wide like the avenue in my previous shot, the Avenue de Wagram. (Which I used as a reference to confirm the identity of this road.)

Seen from satelite imagery it seems to be smaller than its cousin, but I suspect that's because of the presence of more and older trees.

The Avenue Mac-Mahon was named after Marie Edme Patrice Maurice de MacMahon, (Patrice for short), marquis de MacMahon, duc de Magenta, 1808-1893. He was a general (indeed a Marshal) in the French Army, served as Governor General of Algeria from 1864 to 1870 and, despite being a monarchist, he served as President of France from 1873 to 1879.

Oh, and the name? His family background (and hence the background of this street name) comes from Ireland. They were descended from Mahon, the son of Muirchertach Ua Briain, High King of Ireland. Don't ask me to pronounce that. They supported King James II, which did not earn them much favour with King William III (he of the Orange), as a result of which they upped sticks and moved to France, becoming citizens in 1749.

What's that brownish rod sticking up in the distance? We'll come back to that in a clearer shot.