Reilly vs Riley, What's the Difference?

Which to use

“Reilly” and “Riley” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#18,938
“Reilly” frequency rank: #8,343
“Riley” frequency rank: 27281
confusion score

Side-by-Side Comparison

Feature	Reilly	Riley
Definition	A surname from Irish.	A surname.

Same sound, different letters: Reilly vs Riley

Muted letters are shared; highlighted letters are the only spelling cue when pronunciation matches. Shared run: 4 letters. Reilly runs 6 letters (CVVCCV) against Riley's 5 (CVCVV) - the length gap alone is often enough to separate them once you know to check it.

6 ch

Reilly

5 ch

Riley

Homophone desk: Reilly vs Riley

This is the hard kind. Reilly and Riley are pronounced identically (/ˈɹaɪli/) and both work as aname. Neither the ear nor the grammar will rescue you; only the meaning does, so the glosses below are the whole decision. They differ by 1 letter(s) in length. Our composite confusion score for this pair is 27281, derived from the frequency rank of both members and their visual similarity.

Reilly is recorded at frequency rank #18,938, classified as aname, pronounced /ˈɹaɪli/. Riley is at rank #8,343, tagged as aname, pronounced /ˈɹaɪ.li/.

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 27281, this pair ranks #380,179 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Reilly vs Riley

Shared letters: eilry. Private to "Reilly": -. Private to "Riley": -.

"Reilly" · 6 letters · shape CVVCCV · "Riley" · 5 letters · shape CVCVV

Known mistypes of this pair

Reilly ← erilly · reillyy · reily · reilyl · relily · rielly · rreilly
Riley ← irley · riely · rileyy · rilley · rilye · rliey · rriley

Frequently Asked Questions

Is swapping "Reilly" for "Riley" ever safe?

No. They are pronounced the same (/ˈɹaɪli/), which is exactly why they get swapped in writing, but the dictionary meanings above are different, and pronunciation is no guide here.

Which is more common, "Reilly" or "Riley"?

"Riley" is the more common of the two: it sits at frequency rank #8,343 in our English list, against #18,938 for "Reilly". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Sound matches; spelling doesn't. Use the exits below to lock the right form or check a cousin pair.

Full dictionary entry for "Reilly" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "Riley" - compare definitions side by side with the headword page. Word entry
This pair ranks #380,179 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"Reilly" and "Riley" also get mixed up with nearby pairs, the highest-scored neighbour is "Radley vs Riley". Nearby pair
Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes

Confusion rank #380,179 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.