I really like the name Bram (pronounced BRAHM) as a potential name for a hypothetical brother to Hank and Will. I prefer the Bram spelling because it is 4 letters like my sons' names. But I don't want pronunciation issues, with people thinking it is pronounced rhyming with ram. What would you choose? Bram or Brahm?

My furchildren, Dorothy and Johnny

Re: Bram or Brahm?
Sides. There's precedence. Bram Stoker.
Go with Brahm. Who care how many letters are in the name? That sound like en extremely silly reasoning TBH.
Someone suggested Brom, which would fit your four letters, and make me pronounce it as you intended.
I think of Sharon, Lois and Bram from the Elephant Show.