Jones had announced her pregnancy in April, but refused to name the father, fueling speculation it could either be her former boyfriend, comedian Jason Sudeikis, or Matthew Vaughn, who directed her in ‘X-Men: First Class.’

At the time a source close to Jones said that the 33-year old actress was “really looking forward to this new chapter in her life as a single mom.”

The name Xander is sometimes used as a nickname for Alexander, and is also a fairly common given name in the Netherlands.

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