Cognomen Gilljam (Gilljam 
) , all over the world, is a rare surname. The last name Gilljam is habitual in Northern Europe, particularly Sweden, where it is quite a rare surname, Norway, where it is a rare surname, and Finland. Not in comparison with a country's population, it most frequently occurs in Sweden, Germany, and Norway.
| VARIANT | COUNTRY |
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| Gilljam | Brazil, Germany, Sweden, Norway, Finland |
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gustaf gilljam Swedish politician, SE (b. 1832) |
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| hans gilljam (b. 1944) |
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| christine gilljam Swedish politician, SE (b. 1955) |
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| mikael gilljam (b. 1957) |
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| thomas gilljam researcher |
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| david gilljam researcher (ORCID 0000-0001-7421-945X) |
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| britt-mari gilljam researcher |
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| adam gilljam All about Adam Gilljam, a Swedish bandy player., SE (b. 1990) |
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| patricia gilljam swedish fencer, SE (b. 1998) |
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My, Martin, Magnus, Mikael, Samuel, Cattis, Rasmus, Daniel, Gustav, Johnna, Thomas, Hampus, Håkan, Yvonne, Johanna, Jessica, Fredrik, Birgitta, Karolina, Patricia, Alexandra, Charlotte, Marita, Felix, Horst, Jörg, Mr, Ms, Maud, Sara, Anna, Rene, Lena, John, Nina, Emma, Christine, Hans, Maria, Alice, Anton, Araci, Berit, Benny, Kyros, Lotta, Jonas, Jimmy, Ylva, and Catharina