Can Body Hair Be Used for Eyebrows Transplant?

You can use body hair as the donor supply but it may not give you the expected results.  Most doctors use scalp hair as the donor supply since it growth and characteristics are well known and predictable.  Other doctors such as Dr Umar specialize in body hair and you must consult with these specialized doctors for their professional opinion (since they are the ones who actually do body hair transplant surgery).

Yes, body hair can be used for eyebrow transplant, but is not something that is commonly performed by most hair transplant surgeons. Most patients will do well using hair from the head in a more traditional hair transplant technique as long as the donor hair is matched well to the eyebrows.
All the best,

Yes, it is a viable option to restore your eyebrow hair through eyebrow transplantation using body hair, with uGraft FUE hair transplant. FUE—follicular unit extraction—is the required surgical technique for such a need. Advanced FUE with uGraft is capable of transplanting hair from almost anywhere on the body, however, leg hair is ideal for eyebrow transplant for two reasons: -its naturally thinner caliber (which makes for an excellent match to blend with the remaining eyebrow hair).  -its naturally stunted length and slower growth (which makes for less frequent trimming, as you’d surmised). In the absence of good quality leg hair, I have used nape hair for similar reasons.

Body hair is typically not used as a donor site for hair transplantation.  For eyebrows, the most common donor area would be the back of the hairline or temple region where the hair tends to be finer texture.  Transplanted hairs to the eyebrow will retain their growth pattern, so you are correct that you will need to keep them trimmed on a regular basis. Most likely you will need more grafts than you think to look full and natural.  

The body hair can be used but is not the first choice. Temples, back of neck would be a better donor. You will have to keep the hair trimmed very frequently

Body hair would be a very poor match for most people to replace eyebrow hair.  The best hair is usually from the bottom of the hairline at the back of the neck.  There are some patients where there are no good donor sites to match eyebrow hair.

Body hair can be used but the standard is scalp hair. Eyebrow transplants using mostly single haired grafts taken from the scalp requires a special skill in identifying the ‘bend’; that is natural in each transplanted hair. So when put in by the surgical team, the natural curve of the hair must be placed to take advantage of it as it is placed.  It also must be put in laying them flat consistent with your natural eyebrow hairs Too many surgeons without considerable experience can’t seem to get either of these techniques right and if they don’t the eyebrow stick out rather than lay flat as they should.  In your case the darker hair and a slightly bushier eyebrow might help you frame your face, but of course, it is your call 100% as to what you want to look like.

Scalp hair is what's used to fill in or create eybrows, IMO.  I'm unaware of other body hairs being used for transplantation into the eyebrows.