Indra is indeed also frequently used as a feminine name, as many others have pointed out below. So, I think that the "Gender" of this name should be changed feom "Masculine" to "Masculine & Feminine". Indra is also Mongolian, Bhutanese, Urdu, Bengali, Sinhala, Thai, Khmer, Filipino, Malay, Indonesian, and Fijian.Scripts: Индра (Mongolian), اندرا (Urdu), ইন্দ্র (Bengali), ඉන්ද්රා (Sinhala), พระอินทร์ (Thai), ព្រះឥន្ទ (Khmer)Source: https://forebears.io/forenames/indra
Scripts: Индра (Mongolian), اندرا (Urdu), ইন্দ্র (Bengali), ඉන්ද්රා (Sinhala), พระอินทร์ (Thai), ព្រះឥន្ទ (Khmer)
Source: https://forebears.io/forenames/indra