Achaius

Boys' name

Form of Eochaid

Achaius has been given to 5 babies in the U.S. since 2015. 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 2015, with 5 recorded.

Babies named Achaius, 2015

1 in 740,000

Achaius over time, 1880–2025

Boys

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Achaius: meaning, origin, and history

Form of Eochaid

Deeper origin not confirmed in the cited records

What Achaius means

Achaius is a form of Eochaid.

Origin, language, and formation

Achaius is used in English.

Related names and everyday forms

Related names include Eochaid.

American usage and historical context

In the United States, 5 boys were recorded with the name Achaius between 2015 and 2015. Its highest annual count was 5 in 2015; its best national rank was #12,109 in 2015.

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 Achaius?

Achaius had fewer than 5 recorded uses in 2025, so these figures use 2015, the last year it was published.

Among all babies, 2015: 1 in 740,000; 5 of 3,701,574 births
Among boys only: 1 in 383,000; <0.01% of boys
Rank, 2015: Unranked; Fewer than 5 uses
Coin-flip room size: 513,148 kids; Even odds of a second one

Where Achaius sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2015 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 513,148 children born in 2015 and it's an even bet that one of them is another Achaius. In a class of 30 the chance is Under 1%.

When Achaiuss were born

Half of everyone ever recorded as Achaius was born before 2015 — so the typical Achaius is around 10 today.

Median birth year: 2015; About 10 years old
Biggest decade: 2010s; 100.0% of all use
Born in the last 25 years: 100.0%; A modern name
Recorded since 1950: 5; People you could plausibly meet

Choose a decade

2010s — 100.0% of all recorded uses (5).

Is Achaius 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 2015 (5)
Years since peak: 10; Years
Year-to-year steadiness: Not enough data; Too few years
Best rank ever: #12,109; 2015

Spellings of Achaius

Achaius is not the most common spelling — Caius is, with 99.8% against Achaius's 0.21%.

Caius99.8%2,329
Achaius0.21%5

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.

Achaius by the numbers

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

As a boy's name

Rank in 2025: Unranked
Trend vs 5 yrs ago: —
Best rank ever: #12,109; 2015
Peak year: 2015; 5 that year
First recorded: 2015
Last recorded: 2015
All-time count: 5
Count in 2025: Under 5

Names similar to Achaius

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

Jakyius Amirius Arkadius Khaius Jacaius Tarrius Ldarius Quavius Taurius Kearius Amerius Takaius Achyuth Tertius Zarrius Jewlius Marrius Emarius Matius Jakaius Xzavius Arkaius Achai Arcaius

Sibling names for Achaius

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

For a sister

Jessa Coraline Milana Karleigh Honesty Emmalyn Hadlee Elayna

For a brother

Caesar Taj Crosby Kolten Immanuel Raylan Emmet Blaze

Explore around Achaius

Top names of 2015, Achaius's peak year The 2010s in full Other names that peaked in 2015 Boys' names starting with A