Ish Sodhi and Tom Blundell claimed the final two spots in the squad, which was announced in Christchurch this morning.
Coach Gary Stead said it was a proud day for all involved, and eight players would be attending a World Cup for the first time.
In one of the more debated selections, Sodhi defeated Todd Astle in their competition for the second spinning spot alongside Mitchell Santner, while Blundell came from nowhere to take the back-up wicketkeeping role behind Tom Latham.
The rest of the squad, who will have a new coach joining them for the Cup, was largely set in stone for some time. While displaced by Henry Nicholls as Martin Guptill's opening partner, Colin Munro will travel as a back-up batsman and part-time medium pace option, while Colin de Grandhomme and Jimmy Neesham join Santner as the all-rounders in the squad.
Matt Henry and Lockie Ferguson's strong summers with the ball will see them join the experienced pair of Tim Southee and Trent Boult as the Black Caps' premier seam options in the UK, while Guptill, Kane Williamson and Ross Taylor will be relied upon as the Black Caps' three most senior batsmen.
Stead said naming the 15 was a tricky process.
"As with any squad named for a major tournament, there's had to be some tough calls and there will be some disappointed players.
"The key for us was finding the right balance for the squad and making sure we had our bases covered for what is going to be a very competitive World Cup.
"As a one-day unit we've been pretty consistent over the past few years and possess a very experienced group of core players, proven at the top level.
"We will have three training camps through April which will involve many players who are not in this squad as it's important they're ready on stand-by should we lose anybody in the lead up to or at the tournament."
The selection of Blundell will prove to be the most controversial. The Wellington gloveman has never played an ODI, and doesn't even have a solid domestic one-day record, averaging just 23.8 at a strike rate of 79. He missed this season's domestic one-day competition, and has only played one List A game since February 2018, for New Zealand A against Pakistan.
His selection indicates that the Black Caps value having a back-up wicketkeeper with sound glovework, but given that Latham will be expected to play in every game he is fit, Blundell seems to have been taken solely in case of emergency.
Comparatively, a player like Tim Seifert could have filled in anywhere in the batting order in case of injury, tactical changes, or sudden loss of form, and would have added value as either a utility back-up batsman, or simply as back-up keeper.
Seifert could still be on call as an injury replacement if required, while several other players who missed out on the Cup cut will still be part of the Black Caps' three camps in Christchurch this month, as well as their three warm-up matches against Australia in Brisbane in May.
The Black Caps' Indian Premier League contingent will be unavailable for those warm-up games, raising the distinct possibility that a player snubbed from the Cup squad could then shine against a full-strength Australian unit.
But, the Black Caps have now made their choices, and unless injury strikes, the 15 players who will step foot in the United Kingdom are now locked in.
The Black Caps World Cup squad: Kane Williamson, Martin Guptill, Henry Nicholls, Ross Taylor, Tom Latham, Colin Munro, Tom Blundell, Colin de Grandhomme, Mitchell Santner, Jimmy Neesham, Ish Sodhi, Matt Henry, Lockie Ferguson, Tim Southee, Trent Boult.
