I did some searching around to try and work out where the current display name, "Thodjildur "Haukadeler" Jörundardóttir", comes from. I did not succeed.
I assume that "Haukadeler" is a reference to her step-father Thorbjorn the Haukadaler so it does not really belong in her name, certainly not as a Middle Name.
https://books.google.com.my/books?id=jj6cIwMCZqIC&pg=PA75&l...
Doing a Google Books search for "Thodjildur" turns up About 0 results (0.32 seconds).
Surveying Leif and Eric's Wikipedia pages in various languages shows their mother/wife spelled in the following ways:
Icelandic - Þjóðhildar
Norwegian - Thjodhild or Tjodhild
Danish - Tjodhild
English - Thjodhild
Old Norse - Þjóðhildr
I would be happy to add multiple language tabs like her husband has for his name but need the fields to be unlocked first.