Can a friend or a family member donate the saphenous vein for ilial bypass surgery?

Better alternatives: Technically yes. Donated veins ( cadaver ) are used for bypassing arteries of a similar diameter ( primarily leg ). However, long term results are not as good as the patient's own vein or even "artifical tubes". The iliac artery offers another challenge, it ihas a signicantly larger diameter. Vein can be made into a larger diameter tube but this is time consuming. Other tubes do better, longer.

No.: That is a very noble and altruistic idea, but is not something that is done. Other good options for bypass conduit exist, especially for the bypass of iliac arteries so don't worry.

Transplant: A saphenous vein cannot be donated from one person to another. In certain instances cryoprepared (frozen) cadaver veins are used in bypass surgery but only in exceptional circumstances.