Signature ideas for a double surname
A hyphenated or double surname does not have to double the length of the mark that represents it.

A double surname gives a signature two natural anchors instead of one. Most people who sign with both names let one carry the full weight — usually the first — and reduce the second to a single initial or a short flourish.
Start from what your hand already does
Sign your full name on a blank sheet five times without thinking about it, then mark the letters that came out identical every time. Those letters are the skeleton of Signature ideas for a double surname; everything else is decoration you are still negotiating with.
A small connecting mark between the two names, a short dash or a linking stroke, tells the reader these are one identity rather than two separate signatures written side by side.
Decide how much of the name survives
A signature is not a spelling test. Most working signatures keep one initial and the shape of the surname, and let the middle collapse into a line — the eye reads the rhythm, not the letters, and the rhythm is what stays the same on a bad day.
If the two names are used inconsistently elsewhere — sometimes both, sometimes one — pick the version that matches your official documents. A signature that disagrees with your ID is the one that gets a second look.
Test it where you will actually use it
Try it in a box that is too small, on a phone screen, and on the back of a delivery slip. A signature that only works with a good pen on a flat desk is a drawing; the one that survives all three is the one to keep.
You can build any of these in the browser: open the Signature maker, draw or type your name, and place the result straight onto a PDF or Word file. Nothing is uploaded — the document never leaves your device.