| IRINA | Younger sister of Olga and Masha |
| MASHA | Sister of Olga and Irina in "Three Sisters" |
| OLGA | Sister of Chekhov's Irina and Masha |
| ANTON | Creator of Olga, Masha and Irina |
| ANASTASIA | Romanov princess, sister of Olga, Tatiana, Maria and Alexei, who were all executed in 1918 (9) |
| AGILE | Like Olga and Nadia |
| GALILEO | An old Italian astronomer baffles Olga and Eli (7) |
| OLEG | Masculine version of Olga (4) |
| NADIA | Rival of Olga at the 1976 Olympics |
| THETHREESISTERS | Play featuring Olga, Masha and Irina (3,5,7) |
| OLSEN | Elizabeth -, actor and younger sister of twins Mary-Kate and Ashley, featured as Scarlet Witch in The Avengers movie franchise (5) |
| EUGENIE | Forename of the younger sister of Princess Beatrice of York (7) |
| PRIYA | __ Sharma, younger sister of Jai and Nikhil in Emmerdale (5) |
| CLEO | Younger sister of Hollyoaks" Celine and Porsche McQueen (4) |
| MARGE | Younger sister of Patty and Selma Bouvier |
| EVA | Younger sister of Magda and Zsa Zsa Gabor (3) |
| ANGOLAN | Olga and Ann travelled to see someone from the African capital Luanda (7) |
| CORNISH | Vicki in Puberty Blues, and younger sister of Abbie, Isabelle ___ (7) |
| LACEY | __ Kane, younger sister of Callum and Ash who no longer lives with them in Hollyoaks (5) |
| STEPHANIE | Princess ---, younger sister of Albert II, Sovereign Prince of Monaco (9) |
