Liam started as an Irish nickname and ended up America's favorite name — now it's ready for the title role

Liam is Irish — the short form of Uilliam, which is how Irish speakers rendered William. Follow the thread further back and you reach the old Germanic name Willahelm, built from two words: wil, meaning will or desire, and helm, a helmet, protection. Put together, Liam carries a meaning parents have loved for a thousand years: a resolute protector — a boy with a strong will and a protective heart. For the kid who insists on doing it himself and still checks that his little sister got her share, the name fits like a glove.

For most of its life Liam stayed close to home, an everyday name in Ireland while the rest of the world used William. Then, within a single generation, it traveled: through Britain, across the Atlantic, and in 2017 it did something remarkable — Liam became the number-one boys' name in the United States, and it has held the top spot ever since. It ranks near the top in Canada and Australia too, and it keeps climbing in countries that never used William at all. Not bad for a nickname.

Famous bearers haven't hurt: actor Liam Neeson carried the name from small-town Ballymena to Hollywood, and Liam Gallagher put it on festival stages. But the charm of this name never depended on celebrity. It is the sound — brief, warm, and almost impossible to say harshly.

And because English keeps its names in one shape — no cases, no changing endings — Liam looks the same in every line of the book: on the cover, in the middle of a sentence, in the last line before lights-out. What changes is everything around it: the apples he carries home at sunset, the wand he holds up in the dark, the ball under his arm. Four different covers, four different stories, one name holding them all together.

• Liam — The whole name, already as short as a name comfortably gets. Most Liams go through life without any nickname at all — the name on the birth certificate, the cover and the classroom roster is one and the same.
• Lee — The playground shortening — quick to shout across a backyard, and the natural pick for teammates and best friends.
• Li-Li — Toddler-talk, usually invented by a younger sibling who can't manage the whole thing yet. It rarely survives preschool, but grandmothers tend to keep it the longest.
• Liam Óg — An Irish tradition worth borrowing: óg means young, and Liam Óg is what you call the youngest Liam in the family — handy when he is named after his dad or grandpa.