No, not Sirius. And unlikely to be Orion. (Harry can't imagine that he'd be as welcoming to a Potter in a strange land.) Either he's some mysterious future-Black, unlikely given that the line is dead, or Regulus.
"Ah, we're family then. Sirius was my godfather." He could let the issue lie, but that's never really been one of Harry's better qualities. Mr Black has a name now and it would be polite not to push. Still, if there's a chance, he might as well try. "Last I saw him, Kreacher was well. We didn't always get on at first, but we've learned to respect each other. Or, well, I respect him. I'm not entirely clear if he likes me or not, but neither he nor the house have been actively trying to poison me lately, so that's a plus."
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"Ah, we're family then. Sirius was my godfather." He could let the issue lie, but that's never really been one of Harry's better qualities. Mr Black has a name now and it would be polite not to push. Still, if there's a chance, he might as well try. "Last I saw him, Kreacher was well. We didn't always get on at first, but we've learned to respect each other. Or, well, I respect him. I'm not entirely clear if he likes me or not, but neither he nor the house have been actively trying to poison me lately, so that's a plus."