A transmitter may be known by an occupational affiliation, such as a craft or trade. A word may also be shared by a place name, occupation and personal title, so its familiar meaning is not enough for identification.
Verbal similarity does not establish the same type of affiliation.
Cause of designation asks why the particular person acquired the label.
Chain comparison brings together family, occupation, locality and the evidence of pupils.
An occupational label can remain associated with someone through a family or earlier connection even if the individual no longer practices the trade. This requires evidence rather than speculation.