Under the Hood: How First Name Cleaner Works

Most name-cleaning tools run a single rule: capitalize the first letter. That handles the simplest cases and little else.

First Name Cleaner is built around what actually shows up in Klaviyo profiles pulled from Meta, Shopify, and CSV imports. We've cleaned over 100,000 contact records by hand over the last decade, and we know what garbage looks like.

Step 1

Clean

Every record is cleaned automatically. It's fast (milliseconds per record) and fixes the vast majority of cases:

  • ALL CAPS (JENNIFER) → Jennifer
  • all lowercase (jennifer) → Jennifer
  • Full name in the first-name field (Margaret Sampleton) → split into first and last when you tell us the column holds full names (Margaret / Sampleton, with compound firsts like Mary Jo kept together); in a column you label as first names only it is kept intact and flagged for review rather than truncated
  • Leading/trailing whitespace → stripped
  • Titles and particles (Dr. Jennifer, van) → flagged for review, not silently stripped
  • Hyphenated names (mary-jo) → Mary-Jo
  • Apostrophe names (o'brien) → O'Brien
  • Single characters (H) → flagged for review
  • Numeric strings (48293) → skipped, never published as a name
  • Emoji (😊 Amy) → emoji stripped, Amy extracted

The large majority of records are fixed instantly.

Step 2

Confidence & Review

The remaining records, the ones we can't fix with certainty, are held rather than guessed at. This is where names like "Dr. H", "MARIA DE JESUS", "Van Nguyen", or "麻理子" get flagged as uncertain rather than forced through a blunt rule.

Each flagged record gets a confidence — High, Medium, Low, or Unknown — and rather than guess, we hold the uncertain ones for your review.

Unknown records are never auto-published. They go into your review queue so a human makes the final call.

The Change Report

Every clean produces a full audit trail:

  • Original value
  • Cleaned value
  • Confidence score
  • Review status (fixed automatically or held for your review)
  • Source field (so you can trace bad data back to the intake form or integration that created it)

The report exports to a new Google Sheet in your Drive in one click, or as CSV. If you're an agency, it becomes the deliverable that shows clients exactly what was wrong and what got fixed.

Data Security

  • You connect Klaviyo with an API key you paste in, or link your HubSpot or Mailchimp account directly: stored encrypted, revocable anytime, no password shared
  • Before we write anything, you see a full preview of every change
  • Your original values are saved before any change, and you can restore in one click
  • We never sell your data

First Name Cleaner fixes your contact data.

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1,000 records free every month, plus 5,000 more when you first connect your CRM. No credit card.