QB Issue Resolution:

Try changing the name while it is still in other names. Add a 2 to the end of it for instance. Then convert to a vendor. Once it is converted to a vendor, rename to remove the “2”. It should prompt you to merge it with the already existing vendor (assuming you want them merged).

Resolution for Issue 'duplicate payees are created after quicken conversion' available: Yes (Solved).
Source: Intuit Community forum.

duplicate payees are created after quicken conversion: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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