The C++ standard library continued this culture of "making names unreasonably short and/or adding modifiers that are anything but obvious", e.g. rdbuf, setf, seekg/p, tellg/p, beg (instead of begin[ing]), ends etc.
std::datetime::timepoint<std::datetime::highres> ? Assuming you'd want to keep a separate datetime namespace.
Neither ::highres nor ::high_resolution_clock really is a descriptive name though, because it doesn't really describe what it means. What is a "high resolution clock" here? Does it mean µs resolution? Nanoseconds (as some "newer" Linux APIs support)? What about accuracy?
"chrono" is one of these "sounds cool but is kind of a weird word to use" things.