Name-letter effect

We tend to prefer the letters in our own name.

Nuttin (1985), Narcissism beyond Gestalt and awareness: The name letter effect.

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What is Name-letter effect?

Name-letter effect is a behavioural bias (self & identity family): we tend to prefer the letters in our own name. Personalised names in emails and products. Nudgeswipe rates the evidence as limited. Source: Nuttin (1985), Narcissism beyond Gestalt and awareness: The name letter effect.

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The original study

Nuttin (1985), Narcissism beyond Gestalt and awareness: The name letter effect.

What the paper reports: Nuttin found people preferred the letters in their own first and/or family name, independent of the letters' visual, acoustical, aesthetic, semantic and frequency characteristics.

Summarised from the paper's abstract.

Replications and critiques

Split: the claim that name similarity drives life decisions (spouse, job, home) is rated Mixed. Simonsohn (2011) argues those effects are confounds; he doesn't challenge the letter preference itself. Source →

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The research

Personalised names in emails and products.

● Limited evidence (provisional) Life-decision ("implicit egotism") effects: Mixed (Simonsohn 2011).

Provisional rating: we cite only the original paper so far. It stays provisional until a replication or meta-analysis is added.

Source: doi.org/10.1002/ejsp.2420150309

Limited evidence: a small number of studies, and we haven't yet found independent replications. Treat it as promising, not proven.

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Key takeaways

Honest nudge
Use names respectfully.
Dark-pattern line
Over-personalisation that feels manipulative.

Use it

Apply this with your agent

The prompt carries this bias, its evidence rating and the honest-vs-dark line.

You are helping me apply a behavioural bias ethically in my product.

Bias: Name-letter effect (Self & identity, limited evidence): We tend to prefer the letters in our own name.
How it works: Personalised names in emails and products.
Source: Nuttin (1985), Narcissism beyond Gestalt and awareness: The name letter effect. https://doi.org/10.1002/ejsp.2420150309
Honest use: Use names respectfully.
Dark-pattern line: Over-personalisation that feels manipulative.
Page: https://nudgeswipe.com/biases/name-letter-effect/ (JSON: https://nudgeswipe.com/api/biases/name-letter-effect.json)

Rules: say a brand "uses" a tactic, never that it "worked"; outcomes are not public unless the company published them; no invented uplift estimates; flag mixed evidence. Honest nudge = true, visible, easy to reverse, and in the user's interest. Dark pattern = hides costs, fakes scarcity or popularity, shames, or makes leaving harder than joining. Quote company-published results as "X reports", with the source link, and don’t generalise them. Don’t cite retracted or failed-to-replicate studies as support (e.g. Ariely & Wertenbroch 2002). Don’t state study figures unless they’re on this page or in a source you can link. If an idea crosses the line, link the matching deceptive.design pattern.

Tasks:
1. Ask me for my product, the flow and the goal.
2. Audit where name-letter effect already shapes that flow, for better or worse.
3. Propose 2-3 ethical experiments: hypothesis, variant, primary metric, guardrail metric.
4. Flag dark-pattern risks. Evidence is limited (few studies, no independent replication found), so treat it as a hypothesis. The rating is provisional: no replication or meta-analysis is cited yet.

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Frequently asked questions

What is Name-letter effect?

Name-letter effect is a behavioural bias: we tend to prefer the letters in our own name.

How does Name-letter effect work?

Personalised names in emails and products.

How strong is the evidence for Name-letter effect?

Nudgeswipe rates it limited evidence (provisional). Original source: Nuttin (1985), Narcissism beyond Gestalt and awareness: The name letter effect.

How can you use Name-letter effect honestly?

Use names respectfully.

When does Name-letter effect become a dark pattern?

Over-personalisation that feels manipulative.

In the wild

No teardown yet

We haven't captured a real product or email using name-letter effect yet. Seen one? Use the prompt above to audit your own flow, or browse all teardowns.

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