| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 161 | Cassidy | Irish | Clever; Curly-headed. | F | |
| 162 | Cat | Irish | Pure. | F | |
| 163 | Catelyn | Irish | Variant of Katherine meaning pure. | F | |
| 164 | Cath | Irish | Diminutive of Katherine: Pure. Clear. From the Gaelic form Caitlin. | F | |
| 165 | Catharine | Irish | Form of the Greek Catherine meaning pure. | F | |
| 166 | Cathasach | Irish | Brave. | F | |
| 167 | Catherine | Irish | Variant of Katherine: Pure. Clear. Innocent. From the Gaelic form Caitlin. | F | |
| 168 | Cathleen | Irish | Variant of Katherine: Pure. Clear. Innocent. From the Gaelic form Caitlin. | F | |
| 169 | Cathryn | Irish | Form of the Greek Catherine meaning 'pure'. | F | |
| 170 | Cathy | Irish | Diminutive of Katherine: Pure. Clear. From the Gaelic form Caitlin. | F | |
| 171 | Catlee | Irish | Pure. | F | |
| 172 | Catlin | Irish | Variant of Katherine meaning pure. | F | |
| 173 | Catline | Irish | Variant of Katherine meaning pure. | F | |
| 174 | Catlyn | Irish | Variant of Katherine meaning pure. | F | |
| 175 | Catriona | Irish | Variant of Katherine meaning pure. | F | |
| 176 | Cattee | Irish | Variant of Katherine meaning pure. | F | |
| 177 | Cavana | Irish | From Cavan. | F | |
| 178 | Caycee | Irish | Vigilant. | F | |
| 179 | Ceire | Irish | Saint. | F | |
| 180 | Chiara | Irish | Dark. Feminine of Ciaran. | F | |