The Kai that I'm most familiar with is the Hawaiian name that means "sea". This is the one being featured here. Other possible meanings for this name include "forgiveness" in Japanese, "food" in Maori and "willow tree" in Navajo.
Kai is also considered a diminutive for names like Gerhard, Nicolaas, Cornelis and Gaius/Caius. It is also a feminine variant of Kaja which comes from Katarina.
Internationally, Kai ranks well! It is actually doing better in other countries for boys than it is in the US. However, we're the only country that has a ranking for this name as a feminine one.
This is how Kai ranked in the US:
Boy: 2,387 births (#177)
Girl: 262 births (#1000)
This means the name's unisex ratio is 90% boy / 10% girl based on the births for 2014.
In England/Wales, Kai recently ranked at #64 for boys. Canada (BC) ranked it at #36; it was #69 in Australia, #85 in Ireland, #65 in Northern Ireland, #55 in Scotland, and #121 in the Netherlands. These are the most recent rankings I found so they may vary a bit today.
The name Kaia is a feminine form of Kai that's also ranking well at #551 in the US.
What do you think of the name Kai? It is short and sweet and definitely carries that Hawaiian vibe which gives the name warmth and an exotic feel. It is handsome and cool, bold but not unusual. Are you considering it? If so, here are a few ideas for sibling names and middle names for Kai:
Sibling Name Ideas:
Sisters: Aria, Kamilah, Leilani, Milana, Noa, Sienna, Zoey
Brothers: Arlo, Finnian, Jude, Milo, Orion, River, Silas
Middle Name Ideas:
As a Middle Name:
Unless you're Hawaiian, it is probably going to be difficult to find a middle name that will share Kai's origin. I wouldn't worry about that. The above names simply sound nice and flow well with Kai. What would you pair with Kai?