how are the names assigned for it?
The official route log published by AASHTO , has been named "United States Numbered Highways" since its initial publication. Within the route log, "U.S. Route" is used in the table of contents, while "United States Highway" appears as the heading for each route.
United States Numbered Highway System
The official route log, last published by AASHTO in 1989, has been named "United States Numbered Highways" since its initial publication in 1926. Within the route log, "U.S. Route" is used in the table of contents, while "United States Highway" appears as the heading for each route. A
odd interstate routes run primarily north and south Yes, in U.S.  generally, most north-to-south highways are odd-numbered, with the lowest numbers in the east, and the highest in the west.
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United States Numbered Highway System [SEP] Naming
The official route log, last published by AASHTO in 1989, has been named "United States Numbered Highways" since its initial publication in 1926. Within the route log, "U.S. Route" is used in the table of contents, while "United States Highway" appears as the heading for each route. All reports of the Special Committee on Route Numbering since 1989 use "U.S. Route", and federal laws relating to highways use "United States Route" or "U.S. Route" more often than the "Highway" variants. The use of U.S. Route or U.S. Highway on a local level depends on the state, with some states such as Delaware using "route" and others such as Colorado using "highway".