In Word, the list formats shown at Home tab > Paragraph group > Multilevel List do not have any names.
Word does have a few (three, I believe) built-in list styles. Finding them isn't easy, but they are listed in the Manage Styles dialog box for example. See the attached screen shot.
The recommended approach to create stable numbering is to make use of both a list style and also a paragraph style per numbering level. For more, read
https://shaunakelly.com/word/numberi...g20072010.html.