Adil Adib Dakka, 23, a student at Khaduri University and a member of Islamic Jihad, was arrested in Attil village north of Tulkaram on Wednesday morning.
Aljazeera's correspondent in Tulkaram, Muain Shadid, said 14 people were arrested in the Tulkaram area, eight in Attil alone.
Israeli military sources confirmed the arrest of Dakka, without specifying his connection with Friday night's suicide attack outside a Tel Aviv nightclub, which killed five Israelis.
Israeli officials have blamed the attack on Islamic Jihad's armed wing, al-Quds Brigades.
Tel Aviv says it has evidence proving the attack was ordered by the group's headquarters in Damascus but has not provided further details.
Shadid reported that all the detainees were from Islamic Jihad, except one named Muhammad Ammus, who he said was a Palestinian general intelligence official.
Ammus was arrested on Saturday.
The attack in Tel Aviv was the first in nearly four months, puncturing Israeli and Palestinian efforts to observe an informal truce agreed to at last month's Sharm al-Shaikh summit.
Abd Allah Badran, of Tulkaram, was said to be the bomber behind the blast.
Tulkaram is one of five West Bank towns that Israel promised to hand over to Palestinian security forces at the summit on 8 February.