SiuvssixWhich spelling fits?

Quick tell: Siu is a name, six is a num, so they fill different roles in a sentence.

Which to use

“Siu” is a name and “six” is a num - they look or sound alike but fill different roles in a sentence.

#34,689
“Siu” frequency rank
#519
“six” frequency rank
35208
confusion score

Side-by-Side Comparison

Feature Siu six
Definition A surname. A numerical value equal to 6; the number following five and preceding seven. This number of dots: (••••••).

Letter map: Siu vs six

Shared letters muted; letters that set Siu and six apart highlighted. Shared run: 2.

3 ch
Siu
3 ch
six

Part-of-speech tell for Siu / six

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: Siu is aname and sixanum. On the page they differ by a single letter - u in “Siu” becomes x in “six”. Our composite confusion score for this pair is 35208, derived from the frequency rank of both members and their visual similarity.

Siu is recorded at frequency rank #34,689, classified as aname. six is at rank #519, tagged as anum, pronounced /sɪks/.

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 35208, this pair ranks #313,975 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Siu vs six

Shared letters: is. Private to "Siu": u. Private to "six": x.

"Siu" · 3 letters · shape CVV  ·  "six" · 3 letters · shape CVC

Frequently Asked Questions

Is swapping "Siu" for "six" ever safe?
No - they are not even the same part of speech. "Siu" is a name and "six" a num, so a sentence built for one is usually ungrammatical with the other.
Frequency check: "Siu" vs "six" - which ranks higher?
"six" is the more common of the two: it sits at frequency rank #519 in our English list, against #34,689 for "Siu". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Done with this confusable. These links stay specific to "Siu" and "six".

  • Full dictionary entry for "Siu" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "six" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #313,975 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
  • "Siu" and "six" also get mixed up with nearby pairs, the highest-scored neighbour is "Sif vs Siu". Nearby pair

Confusion rank #313,975 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list