Short answer
Most retail, food service and hospitality badges show first name only for staff privacy, while healthcare and some regulated settings often require a full name or last initial plus credentials. Check your state and employer rules first, then choose a size that fits the longest line.

| Setting | Common practice |
|---|---|
| Retail and restaurants | First name only |
| Hotels and front desk | First name, sometimes hometown or languages |
| Hospitals and clinics | Name plus license or role, often required by state rules |
| Banks and offices | First and last name with title |
| Schools | Title and last name for teachers, first name for many staff |