The name Ekron in the Bible
There's only one Ekron is the Bible. It's the name of one of the cities of the Philistines, also known as the Five cities of the Philistines (in a fleeting moment of flippancy BDB Theological Dictionary even talks about the Famous Five).
It's curious that here are six cities mentioned but only five lords (also see Judges 3:3), but perhaps two cities were simply run by one regent.
Ekron is also the infamous home of Baal Zebub (2 Kings 1:2) but possibly even more renowned as the final station of the Ark of the Covenant during it's illicit Palestine excursion.
When the Philistines swipe the Ark of the Covenant they send it on a tour of destruction through their country. When it reaches Ekron the Philistines finally get the message and send the Ark back to Israel (1 Samuel 5).
Etymology of the name Ekron
The name Ekron comes from root עקר (aqar), meaning to uproot:
Note that Zephaniah engages in wordplay when he writes, "... and Ekron will be uprooted..." (Zephaniah 2:4).
The NOBSE Study Bible Name List apparently goes with a general, underlying meaning of the root עקר and reads Extermination. Jones' Dictionary of Old Testament Proper Names sticks to the meaning of to uproot and interprets it as Uprooting, Emigration.