Name discrepencies between passports

I'm a French-Italian bi-national

My main, French, passport is currently unavailable and I need to travel, so I'm using my Italian passport but both are different

My French passport correctly refers my three given names (in the 'Nicolas, Given Name 2, Given Name 3 FORMICHELLA' form) as does my birth certificate but the Italian registry didn't do that when registering my birth and so I have a single name ('Nicolas FORMICHELLA') from the Italian administration standpoint.

When booking flights, getting visas... I'd always fill all my names in the forms as written in my French passport but that causes a problem for my situation

Can I travel with the Italian passport? Or do I need to contact the airline for them to change my names to the single one?

And for the other way around, If I ever fill a form without the names and only my single name, can I use my French passport there?

Note: I'm talking about travel booking and not visas as you of course need to match the passport

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Can you have 2 different names on different passports?

Thanks... Answer: There is no guarantee that you would have problems using two passport with different names in them but it is quite likely that you will. Passports should be used which have your current legal name in them.

Is there any problem with single name on passport?

As long as you have a Surname in your passport, you will not have MAJOR problems. If there is no surname in your passport, stop right here and get your name changes in your passport first before going forward with any application or study abroad process. Empty (or blank) Surname in Passport equals TROUBLE.

Does space in last name matter?

Answer: It will not be a problem but your name may be shortened if it does not fit the space on the passport data page. However, your full name will be encoded into the chip and will appear when the passport is scanned.

What to do if your Name doesn't match in Documents?

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