Is it okay if my flight ticket has one extra word in my surname?

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My surname previously had 2 words, X Y, which is how it is currently listed on my flight ticket. However, I recently become a citizen of a different country and obtained a new passport. In my new passport the last word in my surname is discarded, so my surname is currently only X. I also surrendered my old passport, so I can not use that to travel.
My first/given name is still the same.
Do I need to contact my airlines and request them to adjust my surname? Or is it fine to leave it as it is?
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What if my last name is different on my plane ticket?
Seeing as technically the name on your ticket simply needs to match the passenger's identification on the day of travel, the Department of Transportation on its Fly-Rights page explains: "If your name has recently changed and the name on your ticket and your I.D. are different (or will be different by the time of your ...Does your name have to match your plane ticket?
Even though your boarding pass may not match your government-issued ID (i.e. your middle name is not on it), if your passenger information is correct, there will not be a problem. Bottom Line: Even if you forget to put your middle name in when booking your ticket, chances are there will be no issues when flying.Can you correct a name on an airline ticket?
Generally, only minor name changes or corrections are allowed, such as fixing a typo or updating the ticket to reflect a legal name change (e.g. last name change through marriage). Name changes to transfer flight tickets are generally not allowed for a few reasons.Can you board a plane if your name is spelled wrong?
TSA policy on misspelled namesGenerally, the TSA (Transportation Security Administration) understands typos and will not prevent you from flying with a slightly misspelled name. It's been my experience that the TSA's rules on names matches the rules of the airlines very closely.No last name in Passport: Things you should take care of!
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Laker, Torsten Dettlaff, Henri Mathieu-Saint-Laurent, Monstera