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Mercia

Girls' name

Latinate form of Mercy

Mercia has been given to 114 babies in the U.S. since 1918. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 1919, with 9 recorded.

Babies named Mercia, 2016

1 in 734,000

Mercia over time, 1880–2025

Girls
02.557.51018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Mercia: meaning, origin, and history

Latinate form of Mercy

Deeper origin not confirmed in the cited records

What Mercia means

Mercia is a latinate form of Mercy.

Documented naming usage and pronunciation

Mercia is used in English (Rare).

Origin, language, and formation

Mercia is used in English.

Related names and everyday forms

Related names include Mercy.

Pronunciation and spelling

In English, Mercia is pronounced /ˈmɜːsi.ə/.

American usage and historical context

In the United States, 114 girls were recorded with the name Mercia between 1918 and 2016. Its highest annual count was 9 in 1919; its best national rank was #3,378 in 1919.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Mercia?

Mercia had fewer than 5 recorded uses in 2025, so these figures use 2016, the last year it was published.

Among all babies, 2016
1 in 734,000
5 of 3,669,531 births
Among girls only
1 in 354,000
<0.01% of girls
Rank, 2016
Unranked
Fewer than 5 uses
Coin-flip room size
508,706 kids
Even odds of a second one

Where Mercia sits on the popularity scale

Rarest published (5 a year)#1 — Olivia (13,544)

Chance at least one other child shares the name

If the other children were drawn at random from the 2016 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 508,706 children born in 2016 and it's an even bet that one of them is another Mercia. In a class of 30 the chance is Under 1%.

When Mercias were born

Half of everyone ever recorded as Mercia was born before 1943 — so the typical Mercia is around 82 today.

Median birth year
1943
About 82 years old
Biggest decade
1920s
17.5% of all use
Born in the last 25 years
14.0%
Spread across generations
Recorded since 1950
43
People you could plausibly meet
Choose a decade

1920s — 17.5% of all recorded uses (20).

Is Mercia rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
—
Not ranked then
Rank vs 5 years ago
New entry
Not ranked then
Rank vs 10 years ago
—
Not ranked then
Births vs 10 years ago
—
Not published both years
Share of its own peak
0%
Peak was 1919 (9)
Years since peak
106
Years
Year-to-year steadiness
Shifting
22.4% average annual change
Best rank ever
#3,378
1919

Spellings of Mercia

Mercia is not the most common spelling — Maria is, with 72.3% against Mercia's 0.01%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Mercia around the world

Where Mercia ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    2010–2022
    #5,670
    in 2022
  • France
    2005–2019
    #5,111
    in 2019
  • South Australia
    1945–1984
    #661
    in 1984

Popularity data from Office for National Statistics, Institut national de la statistique et des études économiques and Consumer and Business Services (South Australia). ONS data under Open Government Licence v3.0. INSEE data under Licence Ouverte / Etalab 2.0. CBS SA data under CC BY 4.0.

Mercia by the numbers

The raw record for each sex the name is used for.

As a girl's name

Rank in 2025
Unranked
Trend vs 5 yrs ago
—
Best rank ever
#3,378
1919
Peak year
1919
9 that year
First recorded
1918
Last recorded
2016
All-time count
114
Count in 2025
Under 5

Names similar to Mercia

Matched on shared beginnings and endings, similar length, and comparable popularity.

MerritMerittMercerMerliahMerrinMerrynMerabMerlinaMerionMeriemLucciaMerrilMeralMercieMerialMeraryAmiciaMeryamMerynMeryemMercedMerthaMeritMerian

Sibling names for Mercia

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Mercia

Top names of 1919, Mercia's peak yearThe 1910s in fullOther names that peaked in 1919Girls' names starting with M