Kuiper

/ˈkaɪpɚ/

//ˈkaɪpɚ// name

By · According to Wiktionary data (CC BY-SA) ·

"kuiper" is a 6-letter English headword indexed on PlainSpell.

The verdict

“Kuiper” is uncommon English (frequency #61,579 among 9,255 “K” headwords), classed as a proper noun. The kind of spelling people second-guess.

#61,579
frequency rank, English
9,255
“K” headwords

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A surname from Dutch, Dutch surname equivalent to the English surname Cooper, from the profession cooper (“kuiper”)

Key facts for Kuiper
PropertyValue
HeadwordKuiper
LanguageEnglish
Part of speechProper noun
IPA/ˈkaɪpɚ/
Letters6
Frequency rank#61,579
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “Kuiper” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). Kuiper lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Rare enough to double-check

Kuiper is uncommon English at frequency #61,579 among 9,255 “K” headwords, classed as aproper noun, transcribed /ˈkaɪpɚ/. Rarity is why readers land here mid-draft. 3 senses are on record.

We couldn't generate a plausible misspelling set for Kuiper, and the word's spelling is regular enough that our generator found nothing worth flagging. Our confusable-pair dataset has no match for it, suggesting its spelling stands apart enough that readers rarely confuse it with something else.

Etymologically, the entry records: From Dutch Kuiper. Doublet of Cooper. The correct English form is Kuiper, spelled K-U-I-P-E-R.

Definition

  1. 1
    A surname from Dutch, Dutch surname equivalent to the English surname Cooper, from the profession cooper (“kuiper”)
  2. 2
    Gerard Kuiper (U.S. planetary astronomer)
  3. 3
    An asteroid in Solar System, the 1776th asteroid registered

Etymology

From Dutch Kuiper. Doublet of Cooper.

Synonyms

Asteroid Kuiper1776 KuiperAsteroid 1776

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "Kuiper"?
"Kuiper" is spelled K-U-I-P-E-R. The IPA pronunciation is /ˈkaɪpɚ/.
What does "Kuiper" mean?
As a proper noun, "Kuiper" means: A surname from Dutch, Dutch surname equivalent to the English surname Cooper, from the profession cooper (“kuiper”)
How do you pronounce "Kuiper"?
The IPA (International Phonetic Alphabet) transcription for "Kuiper" is /ˈkaɪpɚ/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "Kuiper"?
From Dutch Kuiper. Doublet of Cooper. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “Kuiper”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is K-U-I-P-E-R - every other letter order is a misspelling in standard orthography.
  • Say it as /ˈkaɪpɚ/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Browse more English words and confusable pairs in the same reference. English words

Other uncommon English words near this rank

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list