Origin of the Mcwilliams Surname
The Mcwilliams surname is of Irish/Scottish origin (Gaelic). In the 2010 U.S. Census it ranked #1,746 with 20,523 Americans (6.96 per 100K people).
What the name meant to the first families who bore it — and how Mcwilliams traveled across regions and centuries — is written out in the full Heritage Report.
Quick Facts
| Surname | Mcwilliams |
|---|---|
| Meaning | Full etymology in the Heritage Report |
| Origin | Irish/Scottish |
| Language | Gaelic |
| US Rank (2010) | #1,746 |
| US Count (2010) | 20,523 |
| Per 100K People | 6.96 |
| First Letter | M |
Ethnic Distribution of Mcwilliams
Among 20,523 Americans named Mcwilliams, the largest self-reported group is White (76.7%).
The full multi-group chart (every percentage, print-ready) is inside the Heritage Report — not repeated here.
Popularity of Mcwilliams Over Time
Between the 2000 and 2010 U.S. Census, the national rank of Mcwilliams moved down. Exact counts for both years — print-ready — are in the Heritage Report.
Where did the Mcwilliams family really come from?
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The Complete Story of the Mcwilliams Family
What you’ve read above is just the overview. Your full Mcwilliams Heritage Report goes far deeper — and it’s yours to keep, print & share with your family.
- ✓ The true origin & meaning of Mcwilliams
- ✓ The Mcwilliams coat of arms & heraldry
- ✓ Migration journey across the world
- ✓ Where Mcwilliams families live today
- ✓ Notable Mcwilliams bearers in history
- ✓ Name variations & spellings worldwide
- ✓ A step-by-step guide to start tracing your own family tree
🎁 A heritage keepsake to pass down — perfect as a gift.
Get one Mcwilliams fact most families never hear by email — a teaser, not the full etymology (that’s in the report).
Similar Surnames to Mcwilliams
These surnames share similar popularity, spelling, or cultural background with Mcwilliams.
Other Irish/Scottish Surnames
Explore more surnames with Irish/Scottish roots. There are 162,254 surnames in our database — here are some that share the same Irish/Scottish origin as Mcwilliams.
Frequently Asked Questions About Mcwilliams
Top Surnames Starting with M
The most common American surnames that begin with the letter M, ranked by population.
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