Casey (guy) and Cassie (gal), great friends from college.
Also, my two best friends’ (one male, one female, not in any way related) from my hometown parent’s names were both Jim and Theresa. Although one was Jimmy and one was James.
My mum’s third boyfriend was a Steve. Her first husband, my dad, is a Steve. She currently married to her second husband, also a Steve. Way to confuse the crap out of everyone, Ma.
Knew a Robert who married a Roberta. We used to call them Bobo & Bert, then Rob & Berta, then… I lost touch.
I have known two different male-male couples named Jeff and Jeff.
My husband went to high school with a guy of Norwegian descent named Kim, who later married a woman named Kim.
Same with my great-grandparents. They called him Frank and her Fran, though.
My oldest sister Sherry has had three husbands named “Terry.”
“Terry” is also the name of my late brother (gone before she married the first one.)
Creeeeeeeeepy.
Oh, and more on-topic, my best and oldest friend has parents named Robert and Roberta, who go by “Bob” and “Bobbi.”
Also from the rhyming names group: My aunt knew the wife-and-husband tandem of Florence and Lawrence.
Similarly, my brother knew a Deborah quite well, and later met her partner Deborah, who was thenceforth referred to as “Deborah’s Deborah”.
Not quite a husband and wife pair, or even real people, but having just seen The Science of Sleep I feel compelled to add Stéphane and Stéphanie.
I’ve got friends who are Chris and Kris, and another couple who are Chris and Krista.
Not the same thing but I have the same name as my SO’s exwife. So he always refers to her by myname hislastinitial. 
. Reminding me she got it first. And even if I get it, I’ll just end up with exactly the same name as her.
They’re pronounced the same here, though - one of our hall directors told us the day we met her about her SO Don… or so we thought until she said “she.” 
Aaron and Aerrin (a 70s-fied spelling of Erin, ftr) are also nearly identical in pronunciation which confused us all when they were dating. I lost track of them after college, though, so I couldn’t tell you if they married or not.