My grandma named all her kids with a J and the three girls also have rhyming middle names. I over heard a conversation this weekend that someone's last name is May and they named all of their kids with other months, including their middle names. One kid is March April May.
My girls both start with the same letter, but not on purpose, I just happened to really like the two names. I gave one of them my mom's middle name and the second one my aunts middle name, so their middle names rhyme too.