What are the different kinds of cases?

• flatcase or mumblecase
• kebab-case. Also called caterpillar-case, dash-case, hyphen-case, lisp-case, spinal-case and css-case
• camelCase
• PascalCase or CapitalCamelCase
• snake_case or c_case
• MACRO_CASE, UPPER_CASE or SCREAM_CASE
• COBOL-CASE or TRAIN-CASE

Names are either generic, after a language, or colorful; most don’t have a standard name outside of a specific community.

There are many names for these naming conventions (names for names!); see Naming convention: Multiple-word identifiers, particularly for CamelCase (UpperCamelCase, lowerCamelCase). However, many don’t have a standard name. Consider the Python style guide PEP 0008 – it calls them by generic names like “lower_case_with_underscores”.

One convention is to name after a well-known use. This results in:

• PascalCase
• MACRO_CASE (C preprocessor macros)

…and suggests these names, which are not widely used:

• c_case (used in K&R and in the standard library, like size_t)
• lisp-case, css-case
• COBOL-CASE

Alternatively, there are illustrative names, of which the best established is CamelCase. snake_case is more recent (2004), but is now well-established. kebab-case is yet more recent and still not established, and may have originated on Stack Overflow! (What's the name for dash-separated case?) There are many more colorful suggestions, like caterpillar-case, Train-case (initial capital), caravan-case, etc.