So we know how a Lalafell name is constructed, but how do the names relate to each other in a family?

I noticed the THM guild is staffed by a band of Dunesfolk brothers: Cocobygo, Cocoboha, Cocobuki, Cocobezi, and Cocobani. Additionally, there's another brother named Cocobusi. The brothers refer to each other by the second half of their name, so just "Bygo" or "Buki."

Is the "Coco" prefix determined by their family lineage, like a surname, or is it passed down from a parent in some way? Like perhaps their father has "Coco" in his name and the prefix indicates they're his sons?

And what happens when Lalafells marry? Do their names stay the same or do they combine in some way?