Kai

Kai is what happens when a name decides to travel light. One syllable, three letters, no baggage. You could shout it across a beach without running out of breath, which, as it turns out, is exactly where it belongs.

The name is Hawaiian, and it means ocean, or sea. That's the whole meaning, and it's a wonderful one. Big, calm, slightly wild, and impossible to argue with. Give a child the sea and you've handed them something that will never go out of style, mostly because it was there before style was invented.

Nothing to shorten

There's no nickname, because there's nothing left to cut. This is either a great relief or a small loss depending on how you feel about pet names. What it does mean is that Kai is Kai from the first day to the last: on the cot, on the exam paper, on the wedding invitation. No Kai-ster, no Kai-Kai, or at least none that will stick past nursery. It's a name that arrives fully finished.

And the world has clearly noticed. Kai is number 27 in Australia and, by a happy coincidence, number 27 in Catalonia as well. It's 51 in Canada, 72 in England & Wales, 93 in the United States and 95 in New Zealand. It's rarer in Mexico City and Argentina but still on the charts. That's an extraordinary spread for such a small name: sunny countries, rainy countries, English-speaking and not. A name that means the sea, it turns out, washes up more or less everywhere.

Namesakes with northern flavour

For a Hawaiian name, the famous bearers have a distinctly northern flavour. Kai Havertz is a German association football player, Kai Hansen a German guitarist and singer, and Kai Wegner a German politician. Then there's Kai Siegbahn, the Swedish physicist. Footballer, musician, politician, scientist: it's the name's way of reminding you that a good short name works in any accent and any career.

Among siblings, Kai belongs to a very particular and very fashionable set. It sits perfectly with Leo and Finn, and it makes a gorgeous pair with Maya or Luna. Short names, soft names, names with a bit of nature and sky in them. If your shortlist already reads like a list of things you might see from a clifftop, Kai will feel like it was always meant to be there.

The one honest caveat is that a name this popular in this many places can stop feeling like a discovery. That's not a reason to avoid it, only a reason to choose it because you love it rather than because it's rare. Rare is a moving target. Love isn't.

So, the sea in three letters. No nickname, no fuss, and welcome in almost every playground on the planet. Is it the one? You'll have to sit with it a while, which is the maddening part of this whole game: the shortest names have a way of needing the longest think. Go and stare at the horizon. It might help. It might not.