The verdict against Haneen Hossam, Mowada al-Adham and three others came after they had posted footage on video-sharing app TikTok.
The ruling, which can be appealed, included a fine of 300,000 Egyptian pounds ($18,750) for each defendant, the source noted.
Haneen Hossam, 20, a Cairo University student, was charged for encouraging young women to meet men through a video app and build friendships with them, receiving a fee according to the number of followers watching these chats.
Mawada al-Adham, a TikTok and Instagram influencer with at least two million followers, was accused of publishing indecent photos and videos on social media.
The three other women were charged with helping Hossam and Al-Adham manage their social media accounts, according to the public prosecution.
Al-Adham’s lawyer Ahmed el-Bahkeri confirmed the sentences and said they would appeal the verdict.
Hossam was arrested in April after posting a three-minute clip telling her 1.3 million followers that girls could make money by working with her.
In May, authorities arrested Adham who had posted satirical videos on TikTok and Instagram.
Lawyer el-Bahkeri said the young women were facing separate charges over the sources of their funds.
Internet penetration has reached more than 40 percent of Egypt’s youthful population of more than 100 million.
“The verdict is shocking, though it was expected. We will see what happens on appeal,” said women’s rights lawyer Intissar al-Saeed.
“It is still a dangerous indicator … Regardless of the divergent views on the content presented by the girls on TikTok, it still is not a reason for imprisonment.”
Several rights activists took to social media to condemn the arrests.
A hashtag trending in Arabic that translates to “with the permission of the Egyptian family” was widely used in an online social media campaign to draw attention to the case and demanded the release of the women influencers.
A petition was also launched on Change.org demanding the release of the influencers with more than 1500 signatures.
“We are a group of women calling on state authorities to stop targeting women on TikTok. We call on the National Council for Women to provide legal support for Haneen Hossam, Mawada El-Adham, Menna AbdelAziz, Sherry Hanem, Nora Hesham, Manar Samy, Reenad Emad, Hadeer Hady, and Bassant Mohamed,” the petition said.
Egypt has cracked down in recent years on female singers and dancers for online content deemed too racy or suggestive.
Last month, an Egyptian court sentenced belly dancer Sama al-Masry to three years for inciting “debauchery” on social media after posting a TikTok dance video.
In 2018, a female singer was detained for “incitement to debauchery” after an online video clip which included sensual dance moves went viral.
The previous year, a female pop singer was sentenced to two years in prison on similar charges, also for a video deemed provocative. Her sentence was reduced to a year on appeal.
“The charges of spreading debauchery or violating family values are very loose … and its definition is broad,” said Saeed.
Egypt has, in recent years, enforced strict internet controls through laws allowing authorities to block websites deemed a threat to national security and to monitor personal social media accounts with more than 5,000 followers