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.

We run a two-pass pipeline designed 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.

Pass 1

Pattern Matching

Pattern matching runs on every record first. It's fast (milliseconds per record), costs nothing to run, and catches the vast majority of cases:

  • ALL CAPS (JENNIFER) → Jennifer
  • all lowercase (jennifer) → Jennifer
  • Full name in the first-name field (Margaret Mihalco) → kept intact and flagged for review (we don’t guess which word is the first name)
  • 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

This pass resolves the large majority of records instantly.

Pass 2

Confidence & Review

The remaining records, the ones pattern matching flags as ambiguous, go to a second pass. 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.

The engine scores each flagged record's confidence — High, Medium, Low, or Unknown — deterministically, and rather than guess, holds 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
  • Cleaning method (pattern match or held for 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
  • We read and write only the first-name field, nothing else
  • 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 don't sell or share your data

First Name Cleaner fixes your contact data, automatically and permanently.

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First 1,000 records free. No credit card.