[jiggawatts]

I would recommend outright copying Rust.

Among other things, it's a systems programming language and hence its naming scheme is largely (if not entirely) compatible with modern C++ types.

I.e.:

    +----------------+-------------------------+------------------------------+
    | Rust           | Modern C++              | Notes                        |
    +----------------+-------------------------+------------------------------+
    | i8             | std::int8_t             | exact 8-bit signed           |
    | u8             | std::uint8_t            | exact 8-bit unsigned         |
    | i16            | std::int16_t            | exact 16-bit signed          |
    | u16            | std::uint16_t           | exact 16-bit unsigned        |
    | i32            | std::int32_t            | exact 32-bit signed          |
    | u32            | std::uint32_t           | exact 32-bit unsigned        |
    | i64            | std::int64_t            | exact 64-bit signed          |
    | u64            | std::uint64_t           | exact 64-bit unsigned        |
    | i128           | (no standard type)      | GCC/Clang: __int128          |
    | u128           | (no standard type)      | GCC/Clang: unsigned __int128 |
    | isize          | std::intptr_t           | pointer-sized signed         |
    | usize          | std::uintptr_t          | pointer-sized unsigned       |
    | f32            | float                   | IEEE-754 single precision    |
    | f64            | double                  | IEEE-754 double precision    |
    | bool           | bool                    | same semantics               |
    | char           | char32_t                | Unicode scalar value         |
    +----------------+-------------------------+------------------------------+