Short version:
Heathcliff, after emily bronte's Wuthering Heights.
Baelfire, after the bonfires during the celebration of Beltane
Long version:
Brothers Heathcliff and Baelfire are early on foundlings in the story, identified by the society they live in as outsiders with an unknown heritage. Yet i wanted their names to suggest consistency and familial roots that likens to celtic or northern European descent (even in an AU). Both names consist of two parts, each one a visual description that is either natural or earthy.
This is also true of their surname - Blackburn - because they were from a people that identified themselves as children of their parents. For instance, Heathcliff, son of Blackburn - but overtime shortened to Heathcliff Blackburn to fit in with the society they coexist with.