As to the origin of 甬, there are two versions: 1. a bell handle; 2. a flower bud. 甬 serves as a phonetic component to form characters.
You may also want to check out the component 用 and the component 甲.
Characters formed by the phonetic component 甬
勇 涌 蛹 甬 俑 湧 踊 傭 埇 勈 恿 嫞 悀 愑 慂 踴 鲬 the same pronunciation yǒng
拥 庸 佣 镛 墉 慵 痈 槦 滽 鄘 the same pronunciation yōng
桶 捅 樋the same pronunciation tǒng
通 嗵 蓪 the same pronunciation tōng
牅 牗 砽 甮 甭 甪 苚 熥 筩 诵 痛 yóng yǒu/yōng yòng béng lù yòng tēng tóng sòng tòng