I'd say
ROK eh, like bokeh, but have no idea if that's right. I like the look better than the sound.
I've always thought
Roch was a handsome name (there's one in my family, sort of - he's *name*-Roch) and
Clarisse and
Roch would be lovely. I'd see what your SIL thinks, but I think it would be a nice honoring name.