This surname combines 相 (sou, shou, ai-) meaning "inter-, mutual, together, each other, minister of state, councillor, aspect, phase, physiognomy", 鮎 (den, nen, ayu, namazu, ai) meaning "freshwater trout, smelt", 愛 (ai, ito.shii, o.shimu, kana.shii, mana, me.deru) meaning "affection, favourite, love", 会 (kai, e, a.u, a.waseru, atsu.maru, ai) meaning "meeting, meet, party, association, interview, join", 合 (gou, ga', ka', a.u, -a.u, a.i, ai-, -a.i, ai, a.wasu, a.waseru, -a.waseru) meaning "fit, suit, join, gō (unit of area & volume - equal to 0.3306 m² in area & 0.1809 liters in volume)", 哀 (ai, awa.re, awa.remu, kana.shii) meaning "pathetic, grief, sorrow, pathos, pity, sympathize" or 藍 (ran, ai) meaning "indigo" with 川 (sen, kawa) meaning "river, stream."
This surname is also used as 相河 with 河 (ka, kawa) meaning "river."

One bearer of this surname is actor, singer, tarento & racing driver named Show Aikawa (哀川 翔) (1961-).
One fictional bearer of this surname is Jun Aikawa (哀川 潤), who is in the 'Zaregoto' novel series.