They weren’t just there for the cattle rustlin’. And the OP doesn’t specify a couple of what.
Romeo and Juliet
Louis and Mademoiselle Antoinette
Napoleon and Josephine
Mickey and the Rodent Queen
Anthony and Cleopatra
Nicholas and Alexandra
Ken and Barbie, Dick and Jane
Well, Superman and Lois Lane
Impressed by Charlie Sexton.
John Mellencamp actually revisited good ol’ Jack and Diane in the song "Eden Is Burning".
Duets about love that mention the names of the singers:
“Home” by Edward Sharpe and the Magnetic Zeros [Jade and Alexander]
“It’s True That We Love One Another” by the White Stripes [Jack and Holly]
Ben Folds (Five) seem(s) to come close, but “Zak and Sara” is the only song of his/theirs I can think of that precisely matches the criteria. “Where’s Summer B.?” mentions Ross and Frank, while “Steven’s Last Night in Town” arguably mentions Steven and Tamara Easter, but the subject of those songs is stated in the title.
Cherry Blue and Mighty Mouse - Big Trouble by David Lee Roth
Rene and Georgette Magritte With Their Dog After the War - Paul Simon
Famous Blue Raincoat - “Jane” is mentioned several times, and the song signs off “Sincerely, L. Cohen”. And they are a couple.
“Della and the Dealer” doesn’t quite make it, as the Dealer is never named. On the other hand, it does contain a dog named Jake and a cat named Kalamazoo, so maybe it qualifies after all?
Snow and Tammy in Informer.
Bennie and the Jets - Candy and Ronnie.
Romeo and Jane - Tonio K
Tarzan and Jane, “Candyman,” Cristina Aguilera.
Romeo and Juliet - Dire Straits
*George, George, **George of the jungle
**Strong as he can be
Ahhh
Watch out for that tree …
Then away he’ll schlep
On his elephant Shep
While Fella and **Ursula
**Stay in step with
George, George,… *
Their coupledness was clearer in the scripts.
Mack the Knife is very busy:
Sukey Tawdry, Jenny Diver
Lotte Lenya, Sweet Lucy Brown
Yes, the line forms on the right, dears
Now that Mack, he’s back in town
Billy Bragg’s Waiting For The Great Leap Forward - Jack and Jacqueline (Kennedy, of course)
Kenny Rogers’ “The Long Arm of the Law”
In Cumberland Kentucky
On a cool hot evening
Billy lay in love with Mary Ann,
She was a rich judge’s daughter
He was a son of a miner
But that night their love was more than they could stand
Same as in the book that inspired her song, Wuthering Heights by Kate Bush names Heathcliff and Cathy.
TCMF-2L
I’m too cool and trendy to listen to Taylor Swift but my understanding is her song Love Story is another that names Romeo and Juliet.
TCMF-2L
The novelty song Jilted John by Jilted John (well known in the UK) names his paramore Julie, quotes her calling him John and also names John’s more successful rival in love, Gordon.
TCMF-2L
Eva, Beware of the City - Magaldi and Eva
Peron’s Latest Flame - Eva & Peron