by any chance not
Ты сегодня, случайно, не видел Тома?
Have you seen Tom today by any chance?
Do you happen to know them?
Ты с ним, случайно, не знаком?
You don't happen to know him, do you?
Ты с ними, случайно, не знаком?
Are you by any chance familiar with them?
У Вас сегодня, случайно, не день рождения?
Is it your birthday today, by any chance?
Тебя, случайно, не Томом зовут?
Your name wouldn’t happen to be Tom, would it?