Sometimes a name is just a name. That’s the philosophy of Waltham-based designer Jess Goble, who doesn’t hesitate to reassign rooms depending on clients’ needs. “You have to look at a space without getting caught up in what it’s called,” she says. “There’s no reason to confine yourself.” Chandeliers provide a subtle clue to the kitchen’s original purpose: dining room. Now the sunny space sees constant use.It was this out-of-the-box thinking that led Tina and Bart Graf to hire Goble to re-imagine the back section of their Lexington Colonial.