This brand name was invented completely from scratch. It has not many obvious connotations. It sounds a bit like "proper" (i.e. "right" or "correct").
The name "introper" has eight characters and three syllables. Three syllable names are used by established brands like Vodafone, Delicious and McDonald's.
This domain was first registered in November 2016. Older domains have an advantage when ranking in search engines.