Ha, good you corrected me. I had been under the impression his first name was Pablo for ages.
However, your edit is another story. The guy (even if he only shared the name Escobar, but especially IF his name was Pablo Escobar) was killed in Medellin, the city which Pablo Escobar terrorized and controlled.
So, there are at least two ironies: 1) A guy who killed others at will (Pablo Escobar) having a namesake getting killed himself, and 2) the city in which Escobar killed so many being the place where his namesake got killed.
Before I do some analysis, keep in mind I never stated the original Pablo Escobar getting killed was ironic.
OK, you say another Pablo Escobar getting killed would not be expected or unexpected. That is a weird statement to make, since there IS an expectation for another Pablo Escobar getting killed in Medellin over a period of time t: one can calculate that probability by looking at the number of Pablo Escobars in Medellin times the percentage of the population of Medellin killed over time t.
The percentage of the population of Medellin in 1993, when Pablo Escobar was killed, was ~1.6 million:
http://www.2747.com/2747/world/city/medellin.htm
In 1991, the number of homicides was about 4000:
http://wikitravel.org/en/Medellín
So, the percentage of the population of Medellin killed (homicides) in say a year in the early 1990's is 0.25 percent.
Thus, the question is how many Pablo Escobars were there in Medellin at that time? Let's first look at how many Escobars there are in the US among just heavily hispanic surnames (94.2 percent Hispanic). Look at appendix A containing just the 639 most frequently occurring such surnames from 115,526 observations.
http://www.census.gov/population/documentation/twpno13.pdf
There were 139 Escobars, so 139/115,526 ~= 0.001 = 0.1% of all surnames can be expected to be Escobar.
OK, thus: (0.0025 x 1.6 million) x 0.001 = 4!!!
So, we can expect 4 people with the surname Escobar to be killed in Medellin in the early 1990's. But, how about people with the name Pablo Escobar??
Since the 16th century, less than 1% of Spanish names include Pablo:
http://www.sca.org/heraldry/laurel/names/spanish/male-given-freq.html
So, 4 x 0.01 = 0.04 people with the name of Pablo Escobar should be expected to be killed in one year in the heydey of Pablo Escobar. Or, we can expect one such Pablo Escobar to be killed every 25 years given the worst murder rate (back then) in the world.
Thus, IF his name really was Pablo Escobar, it would have been an irony. Since only his surname is Escobar, the irony is a bit less, but is still there given how unlikely it is (4 out of 1.6 million).