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Jacek

#12,770 in 2025Boys' name

Form of Jacenty

Jacek has been given to 532 babies in the U.S. since 1965. In 2025 it ranked #12,770 of 13,926 boys’ names in use. Its peak year was 2013, with 37 recorded.

Babies named Jacek, 2025

1 in 663,000

Jacek over time, 1880–2025

Boys
01020304018801900192019401960198020002020

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Jacek: meaning, origin, and history

Form of Jacenty

Deeper origin not confirmed in the cited records

What Jacek means

Jacek is a form of Jacenty.

Documented naming usage and pronunciation

Jacek is used in Polish.

Another recorded pronunciation is /ˈja.t͡sɛk/ for Jacek.

Meaning behind the documented name family

The name developed through Jacek → Jacenty → Ὑάκινθος. The family’s proposed meaning is “The alpine squill (Scilla bifolia)”, recorded in Ancient Greek with the source elements Ὑάκινθος.

Origin, language, and formation

Jacek is used in Old Czech and Polish.

Related names and everyday forms

Related names include Jacenty.

Pronunciation and spelling

In Old Czech, Jacek is pronounced /ˈjat͡sɛk/.

American usage and historical context

In the United States, 532 boys were recorded with the name Jacek between 1965 and 2025. Its highest annual count was 37 in 2013; its best national rank was #3,018 in 2013.

Over 5 years its rank fell, from #7,737 in 2020 to #12,770 in 2025. Over 10 years its rank fell, from #9,069 in 2015 to #12,770 in 2025.

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 Jacek?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 663,000
5 of 3,315,165 births
Among boys only
1 in 342,000
<0.01% of boys
Rank, 2025
#12,770
of 13,926 boys’ names in use
Coin-flip room size
459,581 kids
Even odds of a second one

Where Jacek 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 2025 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 459,581 children born in 2025 and it's an even bet that one of them is another Jacek. In a class of 30 the chance is Under 1%.

When Jaceks were born

Half of everyone ever recorded as Jacek was born before 2008 — so the typical Jacek is around 17 today.

Median birth year
2008
About 17 years old
Biggest decade
2010s
37.0% of all use
Born in the last 25 years
78.9%
A modern name
Recorded since 1950
532
People you could plausibly meet
Choose a decade

2010s — 37.0% of all recorded uses (197).

Is Jacek 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
+281
Places climbed
Rank vs 5 years ago
−5,033
Places dropped
Rank vs 10 years ago
−3,701
Places dropped
Births vs 10 years ago
0.63×
Fewer babies than then
Share of its own peak
13.5%
Peak was 2013 (37)
Years since peak
12
Years
Year-to-year steadiness
Volatile
34.9% average annual change
Best rank ever
#3,018
2013

Spellings of Jacek

Jacek is not the most common spelling — James is, with 67.2% against Jacek'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.

Where Jacek is used

Across 1910–2025, Jacek was most concentrated in Illinois — about 1 in — boys, against 1 in 1,350,814 across all states with data. It was least common in Texas (1 in —).

00 per 100,000

Most concentrated

  1. 1Illinois1 in —
  2. 2Michigan1 in —
  3. 3Texas1 in —

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Jacek has too little recent state data to map, so this covers all years from 1910.

Jacek around the world

Where Jacek 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
    1997–2022
    #4,002
    in 2022
  • Scotland
    2011–2011
    #544
    in 2011
  • Ireland
    2007–2014
    #609
    in 2014
  • Norway
    1880–1995
    #566
    in 1995
  • Canada
    1994–2018
    #2,905
    in 2018
  • South Australia
    1951–1998
    #534
    in 1998

Popularity data from Office for National Statistics, National Records of Scotland, Central Statistics Office, Statistics Norway, Statistics Canada and Consumer and Business Services (South Australia). ONS, NRS data under Open Government Licence v3.0. CSO, SSB, CBS SA data under CC BY 4.0. StatCan data under Statistics Canada Open Licence.

Jacek by the numbers

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

As a boy's name

Rank in 2025
#12,770
Trend vs 5 yrs ago
Down 5,033
Best rank ever
#3,018
2013
Peak year
2013
37 that year
First recorded
1965
Last recorded
2025
All-time count
532
Count in 2025
5

Names similar to Jacek

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

JachinJacionJachaiJacaiJaceyJacoriJacielJaceionJacarriJacenJaceonJacoryJaceyonJacobeJacJacksenJacereJacksynJacierJaccobJacirJackeyJacqueJacub

Sibling names for Jacek

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 Jacek

Top names of 2013, Jacek's peak yearThe 2010s in fullOther names that peaked in 2013Boys' names starting with JPolish Boy Names