In the entire world, Guilain (Guilain 
) is quite a rare masculine forename. The forename Guilain is characteristic of the Democratic Republic of the Congo, where it is quite a rare boy's name, Cameroon, where it is a rare boy's name, and France. Much less frequently, Guilain is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Guilain | Belgium, Cameroon, Gabon, Democratic Republic of the Congo, France |
| guilain joncheray French composer, FR (b. 1958) |
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| guilain denœux |
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Cals, Rougon, Rohmer, Ruello, Nganga, Nkossi, Nsimba, Hazard, Farret, Malonga, Sévrière, Chachay, Carlier, Correia, Couëdic, Bourgis, Charrier, Bertrand, Delanoue, Teissere, Herrmann, Beaudouin, Petron, Bwinika, Cauchy, Achard, Paul, Rogg, Lang, Joly, Niel, Yvon, Mathe, Somon, Caron, Clark, Denisselle, Bihan, Petit, Leduc, Lobut, Houze, Zedde, Majoie, Mukuna, Sohier, Ampion, Aguera, Blanc, and Essimengane