Meghan Trainor’s kids have her last name mainly because she and her husband chose “Trainor” as the family name they present publicly, and they’re legally free to pick whichever surname they prefer for their children.

Quick Scoop: What’s Going On?

  • Meghan Trainor and actor Daryl Sabara share three kids: sons Riley and Barry, and a daughter, Mikey Moon.
  • At least one child is publicly known as having the surname Trainor , which sparked online chatter about why they don’t appear to use “Sabara” instead.
  • There is no evidence of drama between them; it looks like a personal, branding, and family-identity choice.

What We Know vs. What Fans Assume

What’s confirmed:

  • Public posts and articles refer to the kids using the Trainor surname, like “Mikey Moon Trainor,” in birth announcements and Instagram captions.
  • A popular Reddit thread on r/namenerds specifically points out that Meghan’s baby “has her last name and not dad’s last name,” and commenters note this is totally allowed in the U.S. and increasingly common.

What’s not confirmed:

  • Meghan and Daryl have not given an official, detailed explanation like “here’s exactly why we chose Trainor as the kids’ last name” in a formal interview.
  • So everything beyond “they chose it because they wanted to” is speculation, not a stated-on-record reason.

Likely Reasons Her Kids Have “Trainor”

This is where common patterns and fan discussion come in. These are plausible explanations, not official statements.

  1. Name recognition & branding
    • “Trainor” is globally recognizable thanks to her music career, so giving the kids that surname keeps the family unit tied to a highly visible name in pop culture.
 * For celebrity kids, using the more famous parent’s last name is pretty common, because it instantly signals who they’re related to.
  1. Matriarchal or shared-identity choice
    • Some parents simply prefer the mother’s surname, or feel strongly about passing it on if it might otherwise “end” with them.
    • Reddit commenters even celebrate that “baby has her last name and not dad’s last name,” seeing it as a small win for flipping the usual patriarchal naming tradition.
  1. Avoiding hyphenation drama
    • One comment points out that siblings in the U.S. can legally have different last names and suggests they “probably didn't want to do a hyphen but still wanted both their last names to go on.”
 * Skipping a double-barreled name can make things simpler on forms, at school, and in public life.
  1. Private vs. public names
    • It’s also possible (and this gets mentioned in fan discussion) that “Trainor” is being used publicly while legal documents might be more complex, but this is not confirmed and stays firmly in the speculation lane.

How This Fits Celebrity & 2020s Trends

In the 2020s, more couples:

  • Give kids the mother’s surname.
  • Mix surnames in different ways across siblings.
  • Choose the name that best suits public-facing life (especially when one parent is very high profile).

For Meghan specifically:

  • Her public persona and career are deeply tied to the name “Trainor,” from chart hits like “All About That Bass” to judging and media work.
  • Keeping her surname front-and-center for her kids aligns with how fans already see her family and makes the children instantly recognizable in headlines and social media captions.

Forum & “Latest News” Angle

  • Recent coverage around her third child, Mikey Moon Trainor, focuses on the baby’s name story, the surrogate journey, and how her sons helped pick the middle name, but does not question or explain the last name choice.
  • The last-name debate is mostly happening in forums and comment sections, where people argue about tradition vs. choice and celebrate that Meghan’s kids are using her surname.

Bottom line: Meghan Trainor’s kids have her last name because that’s the surname she and Daryl chose for them, likely driven by a mix of personal values, modern naming norms, and the visibility of the Trainor name—not because of any publicized feud or legal issue.

TL;DR:
There’s no official “deep” explanation on record, but in 2026 terms, a famous mom giving her kids her own last name is a perfectly normal mix of personal choice, branding, and modern family naming trends.

Information gathered from public forums or data available on the internet and portrayed here.