I'm compiling a database of every named character in A Song of Ice and Fire. In A Clash Of Kings, Page 7 (Cressen's chapter,) he talks about:
...old Ser Harbert, the castellan of Storm's End in those years.
No mention is made of Ser Harbert's last name - it's not clear at this point if he is a Baratheon. His wiki page at A Wiki of Ice and Fire doesn't state his family name. But then on Page 148 (Davos' chapter), Stannis says:
One day our [Stannis'] great uncle Ser Harbert told me to try a different bird
So Ser Harbert - presumably the same as the castellan of Storm's End - is Stannis' great-uncle. I would have inferred from this that his last name is Baratheon. Have I made a mistake here? Is there any possible way that a great-uncle could have a different last name, or does this confirm that Ser Harbert is a Baratheon? This question is more general genealogy than ASOIAF-specific, but it made more sense to put it on scifi.