This is the 459th most frequent Czech word.
lukáš
"Lukáš" is a Czech male given name, equivalent to "Luke" or "Lucas" in English.
In this sentence, 'Lukáš' is used as a proper noun, specifically a name, to refer to an individual.
Lukáš je můj dobrý přítel.
Lukáš is my good friend.
Here, 'Lukáše' is the genitive form of the name, showing its grammatical use in the sentence as the object of the verb 'zeptat se' (to ask).
Zeptala jsem se Lukáše, jestli přijde na večírek.
I asked Lukáš if he would come to the party.
This uses 'Lukášem', which is the instrumental form of the name, demonstrating a specific grammatical case denoting the role of Lukáš in the context of accompanying or meeting.