My husband thinks middle names are pointless. So when it came time to name my son I had to push to get ONE middle name.
IMO - you are his mom. If you feel so strongly about it, keep pushing. But WHY? I mean most forms say "middle initial" so I guess K would work for both cases. But do you want two middle names just b/c that's what everyone in Hawaii does? Or do you want two b/c you CAN? You could always save a favorite name for your NEXT son if possible. :)
(Guys don't see that "you've housed him for the past 8 months" deal. They see that they're the man, and this is their son. And they don't want to name their son anything weird. )
And I like the name. I remember your post a while back where you wouldn't tell us the name. Many guessed Kale I think. Bane sounds very strong. I like it (but won't likely steal it. Funny b/c I have considered the name Dane.)
Added after reading Hazel's answer: Hmm. I did not know that they will only do THREE names on SS card. That explains why my neice - they added one of her middle names to her first. ie. Her name might have been Leigh Ann Stepanie Jones and her card came back "Leighann Stephanie Jones." Maybe my SIL filled it out wrong? I dunno. Glad the other name was "Ann" and so it sounded fine. But for the rest of her life her legal documents can't just say Leigh. They must say Leighann I think? Ehh this alone would make me want to just have the 3 names and not deal with 4.