Meaning and Name Origin
Jaap \jaap\ as a boys' name is of Hebrew origin, and the name Jaap means "he who supplants". Jaap is a form of Jacob (Hebrew): also possibly from "la-aqov" (hence, Yaakov) meaning "to track or follow". Seldom used as a birth name.
Jaap has 49 different forms via Jacob: Cob, Cobb, Cobby, Giacamo, Giacobbe, Giacobo, Giacomo, Giacopo, Hamish, Iacopo, Iacovo, Iago, Iakob, Iakobos, Iakov, Jack, Jackie▼, Jacko, Jacky▼, Jaco, Jacobi, Jacobo, Jacobus, Jacoby▲, Jacques▼, Jacquet, Jago, Jaime▲, Jake▲, Jakeb, Jakie, Jakob▲, Jakobe, Jakov, Jakub, James, Jamesie, Jamey▼, Jamie▼, Jamsey, Jay▼, Jayme, Jim▼, Jimmie▼, Seamus, Shamus, Yakov, Yakup and Yaqub.
Jaap is an uncommon first name for men but a somewhat popular 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 affiliated names. Popular variation forms of Jaap (#unlisted) listed in the Top 1000 are Hamish, Jack (#41 the previous year), Jackie, Jacky, Jacob (#4), Jacoby (#593), Jacques, Jaime (#468), Jake (#190), Jakob (#458), Jakobe, Jakub, James (#9), Jamey, Jamie (#786), Jay (#372), Jayme, Jim, Jimmie and Seamus (#900). Usage of these boy names reached its peak during the years 1970-1979 and has become significantly lower since, with forms like Jacques, Jamey, Jamie, Jim and Jimmie falling out of fashion. The trendier baby names in this compilation are Jacob (#4), Jacoby (#593), Jaime (#468), Jake (#190) and Jakob (#458), with Jacob and Jake going through a rekindling in popularity. (2014 Birth Statistics)