(Anonymous)
Obviously it makes a difference, otherwise Slughorn wouldn't bemoan the fact that Lily was Muggleborn. And since the wozard are a fairly close knit society, everyone would suspect that she isn't a pureblood just by hearing her name. Again, there is this scene between Hermione and Slughorn, in which he wants to know if there is some sort of family connection.
And, btw., you neither can tell a Jew apart just from looking at him, and they had to suffer greatly nevertheless.
And, btw., you neither can tell a Jew apart just from looking at him, and they had to suffer greatly nevertheless.