Meaning and name origin
Jaap \jaap\ as a boy's name is of Hebrew origin, and the meaning of Jaap is "he who supplants". Jaap is a variant of Jacob (Hebrew): also possibly from "la-aqov" (hence, Yaakov) meaning "to track or follow".
Jaap is not a popular first name for males but a somewhat popular surname or last name for all people (#71705 out of 88799, Top 81%) (2000 U.S. Census).
Displayed below is a comparison of the popularity of the boy name Jaap and its source form. The only popular variation form ranked in the Top 1000/100 is Jacob (#4). (2014 statistics).