Leak suspects report on PHD:
[...] Thread "org.quartz.simpl.SimpleThreadPool$WorkerThread @ 0x7f219ddb0" [...] The stacktrace of this Thread is available. See stacktrace.
The matching javacores from which the stack trace is taken has the thread name:
3XMTHREADINFO "Staging_Worker-1" J9VMThread:0x0000000002BAB900, omrthread_t:0x000055C9EDBDB058, java/lang/Thread:0x00000007F219DDB0, state:R, prio=5
It would be nice to show the thread name in the leak suspects report.