Fibonacci

/fiːbə(ʊ)ˈnɑːtʃi/

//fiːbə(ʊ)ˈnɑːtʃi// name

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

"fibonacci" is a 9-letter English headword indexed on PlainSpell.

The verdict

“Fibonacci” has 11 generated spelling variants in the English index at frequency #42,132. The variants make it a useful spelling check.

#42,132
frequency rank, English
2,507
“F” headwords
11
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A surname from Italian.

Corpus desk

Index EN-fibonacci · Fibonacci · English

Fibonacci · rank #42,132 · 11 variants · 0 confusables

  • FREQ-MID #42,132
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-MID 11 variants
  • BOOK-MID 2,507
  • PHOTO-FINISH festering

Nearest frequency peer: festering (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “Fibonacci”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “Fibonacci” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for Fibonacci
PropertyValue
HeadwordFibonacci
LanguageEnglish
Part of speechProper noun
IPA/fiːbə(ʊ)ˈnɑːtʃi/
Letters9
Frequency rank#42,132
Misspellings tracked11
Confusable pairs0
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “Fibonacci”

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

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

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “festering” (#42,131), “firecracker” (#42,134), “falsetto” (#42,129). Among 2,507 “F” headwords, “Fibonacci” is #42,132. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 11 spelling variants around Fibonacci (IPA /fiːbə(ʊ)ˈnɑːtʃi/), aproper noun. Corpus frequency is #42,132 among 2,507 “F” headwords. Dominant gloss: "A surname from Italian.".

Our generated misspelling index lists 11 likely wrong-spelling variants for Fibonacci, with forms such as "fbionacci", "ffibonacci", and "fibbonacci". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. This entry stands alone in our confusable dataset, since its spelling is unusual enough that it doesn't cluster with a lookalike.

Etymologically, the entry records: From Latin filius (“son”) + Italian Bonacci, a diminutive of Bono, from Latin bonum, ultimately meaning literally, "son of the (little) good man." The correct English form is Fibonacci, spelled F-I-B-O-N-A-C-C-I.

Definition

  1. 1
    A surname from Italian.

Recorded use

Wiktionary example

These source excerpts show how Fibonacci appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. The Italian mathematician Leonardo Bonacci, who was called Fibonacci, introduced the Hindu–Arabic numeral system to Europe.

Etymology

From Latin filius (“son”) + Italian Bonacci, a diminutive of Bono, from Latin bonum, ultimately meaning literally, "son of the (little) good man."

Common misspellings

Also misspelled as:

  • fbionacci
  • ffibonacci
  • fibbonacci
  • fibnoacci
  • fiboancci
  • fibonaci
  • fibonacic
  • fiboncaci
  • fibonnacci
  • fiobnacci
  • ifbonacci

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of Fibonacci - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

fbionacci2ffibonacci1fibbonacci1fibnoacci2fiboancci2fibonaci1fibonacic2fiboncaci2
Edit distance from "Fibonacci"

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 "Fibonacci"?
"Fibonacci" is spelled F-I-B-O-N-A-C-C-I. The IPA pronunciation is /fiːbə(ʊ)ˈnɑːtʃi/.
What does "Fibonacci" mean?
As a proper noun, "Fibonacci" means: A surname from Italian.
What are common misspellings of "Fibonacci"?
Common misspellings include "fbionacci", "ffibonacci", "fibbonacci", "fibnoacci", "fiboancci". The correct spelling is "Fibonacci".
How do you pronounce "Fibonacci"?
The IPA (International Phonetic Alphabet) transcription for "Fibonacci" is /fiːbə(ʊ)ˈnɑːtʃi/. 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 "Fibonacci"?
From Latin filius (“son”) + Italian Bonacci, a diminutive of Bono, from Latin bonum, ultimately meaning literally, "son of the (little) good man." 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "Fibonacci", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 9 letters (nearest by frequency rank).

festering#42,131faithless#42,128electrics#42,113Giancarlo#42,154

Similar misspelling depth

Headwords with a similar count of attested misspellings (11 here; floor ≥5).

flanker11 variantsFORTRAN11 variantsglittery11 variantsdateline11 variants

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

Source: FrequencyWords open word-frequency list