Why does Katherine Mansfield use the same names for characters in her short stories?

If we look at a range of Mansfield's excellent short
stories we can see that two families are used again and again in her fiction. In "The
Garden Party" for example, the Sheridan family, with their children Jose, Laura and
Laurie are introduced, and they crop up again in a number of stories, such as "Her First
Ball." Likewise in "The Doll's House" we see the Burnell family, with their three
daughters, Lottie, Kezia and Isabel. These again appear in other stories such as "The
Prelude." It is interesting that Mansfield chose to write lots of her stories focusing
on one of these two families and to present New Zealand society through them. We see
from these stories that Kezia Burnell is presented as being more sympathetic and
different to her sisters, and is used often to show criticism of the way that the others
in her family have accepted the social norms and conventions of the
day.