This is the 7961st most frequent Russian word.
коломойскому
"Коломойскому" is the dative case of "Коломойский," a surname, typically used to refer to Ihor Kolomoysky, a Ukrainian businessman. It means "to Kolomoysky" or "for Kolomoysky" in context.
This is a proper noun in dative case, which is used to indicate the recipient of the action (handing over).
Он передал письмо Коломойскому на ближайшей встрече.
He handed the letter to Kolomoisky at the nearest meeting.
This is a proper noun in dative case, indicating the indirect object of the verb (asked to).
Вопрос был задан Коломойскому во время конференции.
The question was addressed to Kolomoisky during the conference.
This is a proper noun in dative case, indicating to whom the information was provided.