Cycloalkanes are named as per their acyclic counterparts with respect to the number of carbon atoms in their backbones, e.g., cyclopentane (C5H10) is a cycloalkane with 5 carbon atoms just like pentane (C5H12), but they are joined up in a five-membered ring.
sˈaɪkloʊlkˌeɪnz ɑːɹ nˈeɪmd æz pɜː ðɛɹ ɐkˈaɪklɪk kˈaʊntɚpˌɑːɹts wɪð ɹᵻspˈɛkt tə ðə nˈʌmbɚɹ ʌv kˈɑːɹbən ˈæɾəmz ɪn ðɛɹ bˈækboʊnz, ˈiː.dʒˈiː., sˈaɪkloʊpˌɛnteɪn sˈiː fˈaɪv ˈeɪtʃ tˈɛn ɪz ɐ sˈaɪkloʊlkˌeɪn wɪð fˈaɪv kˈɑːɹbən ˈæɾəmz dʒˈʌst lˈaɪk pˈɛnteɪn sˈiː fˈaɪv ˈeɪtʃ twˈɛlv, bˌʌt ðeɪ ɑːɹ dʒˈɔɪnd ˌʌp ɪn ɐ fˈaɪvmˈɛmbɚd ɹˈɪŋ.