Yes, but the pronunciation was filtered through three Anglophones before it got to me, and then on a international phone line. I'd pronounce Lucas 'Lookass,' English style, and there was no 'S' in the pronunciation we received.
I'd suppose that you're right, McGrath, I just hoped there was a Portuguese speaker who could put me right. I'd looked at a similar site.

I'd never noticed the extra U in Portuguese before, either.