Liam

Also Italian (Modern): https://www.istat.it/it/dati-analisi-e-prodotti/calcolatori/contanomi

Also Danish (Modern) and Norwegian (Modern): https://www.nordicnames.de/wiki/Liam

This is also a popular Hebrew name and has been top 50 in Israel for many years. It means "I belong to my nation" and is also considered an acronym of a biblical hope for peace: From Isaiah 2:4, “Nation will not take up sword against nation, nor will they train for war anymore.” If you take the first letter of each of the last four words of this verse, לא ילמדו עוד מלכמה — “nor will they train for war anymore,” it spells out Liam." (https://www.ifcj.org/learn/holy-land-moments/daily-devotionals/our-different-names)

Also Spanish (Modern):

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https://www.ine.es/widgets/nombApell/index.shtml?L=1
https://www.behindthename.com/name/liam/top/chile
https://www.behindthename.com/name/liam/top/mexico
https://www.behindthename.com/name/liam/top/argentina

BTW "LIEM" in Hebrew is "my mother" and can be used for both boys and girls.

Usage: Irish, English (Modern), French (Modern), Swedish (Modern), Danish (Modern), Norwegian (Modern), Dutch (Modern), German (Modern), Finnish (Modern), Czech (Modern), Slovak (Modern), Hungarian (Modern), Polish (Modern), Russian (Modern)

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Pronounced: LEE-əm (English), LYAM (French, Danish, German), LEE-am (Swedish, Norwegian, Slovak), LEE-ahm (Finnish), LI-am (Czech), LEE-awm (Hungarian), LYEE-am (Polish)

In 2018, 2 is the most common age for an American (U.S.) Liam who is registered male with the Social Security Administration. It is the 726th most common male first name for living U.S. citizens.

It's more of a nickname for Uilliam.

In Ireland 'Liam' is not a shortened form of the English name 'William'. It is a full name in its own right. When I was growing up in Northern Ireland, catholic people who wanted to call their son 'Liam' would often officially name him 'William' because giving a child an Irish name was a sure way of broadcasting his religion. This, of course, could be detrimental, not only in social life, but also in business and career life. It wasn't the same as, for instance, calling him Jonathon, but shortening it to Jon or Jonny. Liam would always have been the name that the parents intended their son to be known by. It's the same for other names such as Sean/John, Seamus/James, etc. I grew up with lots of people with these names and they were never known by anything other than their Irish name until they started work, where they would most likely have gone by the English version to avoid any problems.

Should be added to English names as well, since it is common in Australia, England and the United States.

Liam is not "centuries old." William is centuries old. Liam is an annoyingly trendy (and recent) nickname.

I think this name is more popular outside of Ireland; I don't think many young boys are named this anymore.