No, Delong and DeLong aren't Italian names. The article 'de' means 'of, from' in French. The equivalent in Italian is 'di'. But it may have started out as an Italian name that was translated into French by Italians who decided to settle in France or French speaking areas of Italy.
For example, the Dutch last name 'Vanderbie' originally comes from Italy. The family was 'Abella' in the Genoa/Pisa area of north Italy. The name became 'Abeille' with a move into France. And then it became 'Vanderbie' with the branch that relocated to the Netherlands.
Yes, Antonio is an Italian name.
Trevino is an Italian last name.
No, Renée is not an Italian name because it is instead French.
The name Dior is French, not Italian.
It is Italian.
Barrett DeLong's birth name is Barrett James DeLong.
Sophie Delong was born in 1957.
Solomon DeLong died in 1925.
Solomon DeLong was born in 1849.
Jia Delong was born in 1985.
Barrett DeLong is 5' 10".
Lauren DeLong is 5' 2".
Mardi DeLong is 5' 3".
Candice DeLong goes by Candy.
Keith DeLong was born on 1967-08-14.
Russell V. DeLong died in 1981.
Russell V. DeLong was born in 1901.