Big 5 names are made up, call them whatever you want, but the categories those names are put in are not made up. They're result of Factor Analysis in all person

Big 5 names are made up, call them whatever you want, but the categories those names are put in are not made up. They're result of Factor Analysis in all personality questions to date which comes in different levels of resolution. They only put names in the top 5 resolution to make sense out of it, but you can have 1000, 1000000 categories at which point there's one category per question and the whole exercise stops being useful, so we have to reach a certain level of grouping that becomes applicable in real-life. The widely agreed is 5 factors and 10 aspects per factor.