gṛhapati (English spelling) grhapati

Japanese: gṛhapati（英語表記）grhapati

…Household rituals were very important, and by the 4th century BCE the Gṛhya-sūtra (Family Sutra) had been created among the Brahmins, detailing household rituals including weddings and funerals. The head of the household was called gṛhamedha or gṛhapati, and in Buddhist scriptures and inscriptions, gṛhapati meant a wealthy merchant or farmer, and was translated into Chinese as 'layman.' (2) Kula originally meant a group, and usually referred to a family, but since the emphasis is on blood ties, it is often used to refer to a somewhat broader range of relatives. …

From [Lay Buddhist]

…
[India]
The original word for layperson in Indian Buddhism is gṛhapati, which originally meant a wealthy person. During the early Buddhist period, the use of iron became widespread mainly in the Magadha Kingdom, and the development of agricultural tools led to the sale of abundant agricultural products to various regions, resulting in the emergence of wealthy merchants and industrialists.

*Some of the glossaries that mention "gṛhapati" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…家での祭式は非常に重要であって，前4世紀ごろまでに《グリヒヤ･スートラGṛhya‐sūtra(家庭経)》がバラモンの間でつくられ，結婚式や葬式を含む家での祭式が詳しく規定された。家長はグリハメーダgṛhamedha，グリハパティgṛhapatiなどとよばれ，仏教経典と碑文ではグリハパティは富裕な商人や農民を意味し，〈居士〉と漢訳された。(2)クラは本来集団を意味する語で，ふつう家族をさし，血縁を重点におくところから，やや広い範囲の親族をさす例が多い。…