There is no Swahili meaning. Gregory is simply a name from English, also found among Swahili-speakers but not especially common.
The Swahili word is "shetani".
The Swahili word for grief is huzuni.
The Swahili word for pastor is "mchungaji."
The Swahili word for goat is "mbuzi."
The Swahili word for master is "bwana".
The Swahili word for "nothing" is "hakuna."
The Swahili word for "Honey" is "asali".
The Swahili word for "Hippopotamus" is "kiboko".
The Swahili word for "Skin" is "ngozi".
Swahili word for desert is "jangwa"
The Swahili word to learn is 'kufunzwa' . Pronounciation: koo-foon- zuwa
The Swahili word, mbili means 'two'.