I don't know that Britta kept her maiden name. The story mentioned the name of Tripp's fiance, before he married her.
Track is the groom, not Tripp. Tripp is Bristol’s toddler and is Trig’s nephew.
Thank goodness they had a girl and gave her a pretty name. I was afraid that they would have a boy and name him “Trick” or “Tran” or “Train” or some other weird name.