Attached is a MS Word document that produces labels for 0.1” DuPont header housings.
It is always best to place several of the same header labels on a page as you might accidentally damage one 
More Rows and Columns can be added as needed.
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Make lettering changes as needed.
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Print the page with several labels on it. Colored paper can add interest.
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Roughly cut out the label leaving boarder margins.
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Place thin ‘Double Stick’ tape on the back of the cut-out. One-inch tape should be easily sourced.
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Laminate the front of the label with clear packing tape.
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Trim the border of the label with a utility knife.
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Remove the tape backing and install the label on the header housing.
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Use flush cut nippy cutters to trim any overhanging label.
Attached is a ZIPPED file of the .DOCX file with a sample header label you can modify.
MD5 is C4261B275B923733A5C87E03B60574CF
Header Labels.zip (11.6 KB)
See this link for UNO labels:
https://forum.arduino.cc/t/arduino-uno-header-labels/917713?u=larryd