Had laposcopic surgery for gallbladder removal & hernia repair in dec since I have had bad belly button odor that I never had. Is this related?

Maybe. I presume you had laproscopic surgery via you belly button, you may have a small suture granuloma or an small deep area of non healing wound in your incision site, follow up with your surgeon.
Suture. This is most likely related to an infected suture. If the suture is absorbable, it will heal on its own over weeks to months. If the suture is permanent, it will have to be removed for it to heal. Call your surgeon for a follow up visit to check it out.