Bella doesn't think the mermaid lives in Thatcher, which makes it Harlowe, but Thatcher's on the way to Harlowe from here.
She knows not to go swimming with her and this will have to do.
She goes up to the mermaid.
"Excuse me. I try not to walk around outside by myself. Are you heading towards Thatcher? Harlowe's right past it," she adds.
"That is simpler. Especially if you live in smaller groups or have more names to choose from than we do. There's at least one other Isabella at this school; I've heard somebody shouting for her and I didn't know them."
"That's not the only reason we have last names and nicknames, but we do use both for that purpose," Bella says. "Last names are also a family thing, and they're more formal - that's why teachers use them - and nicknames allow for personalization and informality, like how I prefer 'Bella'."
"My last name is Swan because my father's last name is Swan," Bella explains. "When my parents got married, my mother changed her last name to Swan for the same reason. Modern families sometimes do different things with them, but that's the basic idea, around here."
"Nope! If you meet two people with the same last name there's a good chance they're related. Although it can also be a coincidence, it makes it likely enough that you can ask if you want to know."
"They could be siblings, or first cousins whose fathers are brothers, or second cousins whose paternal grandfathers were brothers, and so on - or one could be the niece or nephew of the other, assuming the right genders and/or pattern of marriages," says Bella. "It's not going to help you figure out anyone else - it's not really designed to be completely informative about that to people who don't know the family, just to connect wives and children to their husbands and fathers."
"I think you can get along without knowing all this," says Bella. "It's not a big deal, especially here where people aren't generally present with close family."