Robert Clarence Irwin goes by Bob.
Julienne Irwin goes by Jules.
Blair Irwin goes by Blair.
Irwin Fleischner went by Flick.
Irwin Bazelon went by Bud.
Clarence Landry went by Frenchie.
Clarence Snodgrass goes by Bobby.
Clarence Robello goes by Boola.
Clarence Kapraun goes by Kap.
Clarence Burke went by Jonnie.
Clarence Nash went by Ducky.
Lance Irwin goes by Uncle Tuff.
Bindi Irwin and Ashton Irwin are not related with each other at all from what we know. They might have some connection but you would have to go in depth to find that out. If you ever see or meet one of them, ask them!