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Seidi

Girls' name

Lady, princess, through Sadie

Seidi has been given to 17 babies in the U.S. since 2005. 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 2008, with 7 recorded.

Babies named Seidi, 2008

1 in 562,000

Seidi over time, 1880–2025

Girls
0246818801900192019401960198020002020

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Seidi: meaning, origin, and history

Lady, princess, through Sadie

Deeper origin not confirmed in the cited records

What Seidi means

Seidi belongs to the name family reached through Seidi → Sadie → Sarah. Its meaning is “lady, princess”.

Origin, language, and formation

Seidi is used in Finnish.

Seidi comes through English Sadie.

Related names and everyday forms

Related names include Sadie and Sarah.

Pronunciation and spelling

In Finnish, Seidi is pronounced /ˈsei̯di/.

American usage and historical context

In the United States, 17 girls were recorded with the name Seidi between 2005 and 2008. Its highest annual count was 7 in 2008; its best national rank was #15,117 in 2008.

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 Seidi?

Seidi had fewer than 5 recorded uses in 2025, so these figures use 2008, the last year it was published.

Among all babies, 2008
1 in 562,000
7 of 3,930,727 births
Among girls only
1 in 270,000
<0.01% of girls
Rank, 2008
Unranked
Fewer than 5 uses
Coin-flip room size
389,226 kids
Even odds of a second one

Where Seidi 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 2008 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 389,226 children born in 2008 and it's an even bet that one of them is another Seidi. In a class of 30 the chance is Under 1%.

When Seidis were born

Half of everyone ever recorded as Seidi was born before 2007 — so the typical Seidi is around 18 today.

Median birth year
2007
About 18 years old
Biggest decade
2000s
100.0% of all use
Born in the last 25 years
100.0%
A modern name
Recorded since 1950
17
People you could plausibly meet
Choose a decade

2000s — 100.0% of all recorded uses (17).

Is Seidi 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 2008 (7)
Years since peak
17
Years
Year-to-year steadiness
Volatile
40.0% average annual change
Best rank ever
#15,117
2008

Spellings of Seidi

Seidi is not the most common spelling — Heidi is, with 75.5% against Seidi'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.

Seidi around the world

Where Seidi 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.

  • France
    1986–1986
    #2,982
    in 1986

Popularity data from Institut national de la statistique et des études économiques. INSEE data under Licence Ouverte / Etalab 2.0.

Seidi 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
#15,117
2008
Peak year
2008
7 that year
First recorded
2005
Last recorded
2008
All-time count
17
Count in 2025
Under 5

Names similar to Seidi

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

SeirySeinaSeiniSeilahSeikoSeiaSeinnaSeilaniSeijaSeilySeineElidiKeidiSeilaNeidiRemidiSeiraZeidiGeidiJaidiHaidiNdidiSeidinaSeianna

Sibling names for Seidi

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 Seidi

Top names of 2008, Seidi's peak yearThe 2000s in fullOther names that peaked in 2008Girls' names starting with S