Kelly, 48, is due to give birth in less than three weeks and `Saturday Night Fever` star John has revealed the excited couple have already chosen a name for their son, according to America-s Star magazine.
Speaking in Brisbane Australia on 08.11.10 - where the flying enthusiast flew to celebrate Quantas Airlines 90th anniversary - John said "he is due to be born in 19 days" before revealing the name.
The couple announced the pregnancy in May, saying: "It`s impossible to keep a secret ... especially one as wonderful as this. We want to be the first to share this great news with everyone that we are expecting a new addition to our family."
Friends have called the new addition to the Travolta family a "healing baby" after the couple-s 16-year-old son Jett died almost two years ago when he suffered a seizure during a family holiday to the Bahamas.
John - who also has a 10-year-old daughter Ella Bleu with Kelly - has described the moment they found out she was expecting another baby as "a miracle".
The 56-year-old actor explained: "We tried for several years, and we didn`t think it was going to happen for us.
"This is a miracle, and we feel blessed and we are so moved by the generous outpouring of support and goodwill we`ve received from people all over the world."