Our customer (victim) has given us a name of an individual ("boyfriend") who she has sent funds to as part of a Sweetheart scam. All we have is a first name. Would you consider first name only enough to identify a suspect and file a SAR on the boyfriend with the suspicious amount being greater than $5K, less than $25K?

who she has sent funds to as part of a Sweetheart scam

How did she send the funds??

Is it possible that your victim is holding back some information (maybe embarrassed, or some other reason)?
If she is the victim of a scam, that first name is likely a fake.

If she wired money, I imagine she had more instruction than just a first name.

Does she have texts or e-mails with instructions that she can share with you that might help?