The original paper ( and a version on arXiv ) which this relates to does not seem to identify any actual planets. It's clear from the abstract that it is simply suggesting there is evidence that what they describe as unbound planets seem to exist as an inference of the spectral data they have gathered.
They are not identifying any individual planets at all. They have not actually discovered any planets and there is nothing to name.
This is the abstract :
Previously, planets have been detected only in the Milky Way galaxy. Here, we show that quasar microlensing provides a means to probe extragalactic planets in the lens galaxy, by studying the microlensing properties of emission close to the event horizon of the supermassive black hole of the background quasar, using the current generation telescopes. We show that a population of unbound planets between stars with masses ranging from Moon to Jupiter masses is needed to explain the frequent Fe Kα line energy shifts observed in the gravitationally lensed quasar RXJ 1131–1231 at a lens redshift of z = 0.295 or 3.8 billion lt-yr away. We constrain the planet mass-fraction to be larger than 0.0001 of the halo mass, which is equivalent to 2000 objects ranging from Moon to Jupiter mass per main-sequence star.
What they're saying is that, if you accept the hypothesis of their theory and data, there must exist a minimum of about 2000 objects of planet mass per star. There's no way to identify any individual object and no means to verify their claims that I know of.