Jacek is slavic version of the name coming originally from Hyacinth, through the archaic form of Jacenty. Also Jacinto (Spanish), Giacinto (Italian), Jácint (Hungarian)

A myth about Hyakinthos

Hyakinthos was the name of a beautiful boy. He was a son of Sparta's King. The God Apollo fell in love with the young prince. Apollo and Hyakinthos spent much time together talking and hiking through forests and mountains. Then, one early summer day they went to discus throwing. With every throw, the discus would fly higher and higher up in the sky. Apollo threw the discus with all his strength and it flew up into the clouds. Hyakinthos started running to the place where he expected the discus would fall.

There are two version what happened next:

First says: the discus turned over and accidentally hit Hyakinthos's head.
Second version: The God Zefir (The God of the winds) was in love with Hyakinthos, he felt jealous and decided to take revenge by sending the winds to change the discus's direction so that it hit the young boy's head.
The blood started running from Hyakinthos's head. It was running as fast as the life leaving his young body. Hyakinthos was dying in Apollo's arms. Apollo was crying and swearing at his immortality since he could not die with his lover. The blood changed Hyakinthos's black hair into red, running to the ground. Apollo bent over to Hyakinthos's ear whispering, "...in my heart you'll never be dead, my beautiful Hyakinthos. Let the memory about you never die!". With these words, on the place that Hyakinthos's blood soaked in, a delicate red flower grew. A mark of Apollo's sorrow is visible on its leaves - even now, and it was given the name Hyacinthus in memory of the beautiful boy.

Jacek Kurski (Polish pronunciation: [ˈjat͡sɛk ˈkurskʲi], born 22 February 1966 in Gdańsk) is a Polish politician. He was elected to Sejm on 25 September 2005 getting 26446 votes in 25 Gdańsk district, candidating from Prawo i Sprawiedliwość list.

On 8 September 2010, Kurski was the only MEP to vote against a condemnation by the European Parliament of the execution of Iranian national Sakineh Mohammadi Ashtiani by stoning. Kurski stated that he voted against by error, and he corrected his vote almost immediately.

http://www.tvn24.pl/-1,1698272,0,1,kurski-tlumaczy-sie-z-podpisu-i-mija-sie-z-prawda,wiadomosc.html